Missing a great deal because you checked the app too late is frustrating. Missing deals every week because you can't watch several marketplaces around the clock is a business problem.
Whether you're a reseller flipping items for profit or a bargain hunter looking to save money, deal alerts are the difference between occasional finds and consistent success. In this guide, I'll show you how to set up effective deal alerts across Facebook Marketplace, OfferUp, Mercari, Poshmark, Craigslist, Depop, eBay, Vinted, Whatnot, and AutoTrader—both manually and with automation.
Table of Contents
- Why Deal Alerts Matter
- Manual Alert Setup by Platform
- The Problem with Native Alerts
- Automated Multi-Marketplace Alerts
- How to Create Effective Search Criteria
- Alert Frequency and Timing Strategy
- Managing Alert Fatigue
- FAQ
Why Deal Alerts Matter
Good secondhand deals don't last. An underpriced item in a popular category usually draws several messages, and the seller tends to deal with whoever replies first and can pick up soonest. No marketplace publishes how fast items sell, but the pattern is easy to see for yourself: save a few searches, and notice how often the best listings are already "pending" when you finally open them.
For example, imagine a Herman Miller Aeron chair listed for $250 early on a weekday morning. If you only browse after work, you're relying on nobody else having seen it all day.
Solution: Saved-search alerts that tell you when a matching listing appears, so you're not depending on when you happen to open the app.
Manual Alert Setup by Platform
Let's start with native alert options on each major marketplace. Menu names change between app versions, so treat these as a guide rather than exact button labels. None of these marketplaces publishes how quickly its saved-search alerts are sent.
Facebook Marketplace Alerts
How to set up:
1. Search for your target item (e.g., "KitchenAid mixer")
2. Tap the option to save the search
3. Turn notifications on for that saved search (saved searches can be toggled on or off from the Saved Searches section)
Limitations:
- ❌ Notification timing isn't published
- ❌ Marketplace also sends suggested-item notifications, which can bury your saved-search alerts
- ❌ No exclusion keywords (can't filter out "parts only" or "broken")
- ❌ No cross-marketplace searching
Best for: Casual buyers tracking a few broad categories
OfferUp Alerts
How to set up:
1. Open the OfferUp app
2. Search for your item
3. Apply filters (price, distance, condition)
4. Tap "Save Search"
5. Choose push or email alerts
Limitations:
- ❌ Notification timing isn't published
- ❌ Local only (OfferUp scaled back shipping to refocus on local sales in 2025)
- ❌ No exclusion keywords (can't exclude "parts only" or "broken")
Best for: Local buyers focused on a specific metro area
Mercari Alerts
How to set up:
1. Search for your item in the Mercari app
2. Apply filters (price, size, brand, condition)
3. Save the search
4. Check that notifications are enabled for Mercari in the app and on your phone
Limitations:
- ❌ Notification timing isn't published
- ❌ Can't search by seller location (nationwide shipping marketplace)
- ❌ No OR / exclusion syntax (can't search "Nike shoes" while excluding "box")
Best for: Clothing/collectible hunters who can wait for shipping
Poshmark Alerts
How to set up:
1. Search brand or category
2. Apply size/price/color filters
3. Save the search
4. Enable push notifications in app settings
Limitations:
- ❌ Notification timing isn't published
- ❌ Fashion-focused (not great for electronics/furniture)
- ❌ No local pickup option (all shipped)
Best for: Fashion resellers tracking specific brands/sizes
Craigslist Alerts
How to set up (email-based):
1. Sign in to your free Craigslist account
2. Search your category
3. Click "Save Search" next to the search bar
4. On your account's Searches page, tick "Alert" for that search
5. Craigslist emails you when new posts match (Craigslist help)
Limitations:
- ❌ Email-only alerts
- ❌ City-specific (must set up separate searches per city)
- ❌ Poor mobile experience
- ❌ High spam/scam ratio
Best for: Patient buyers checking email throughout the day
eBay Alerts
How to set up:
1. Search for your item
2. Click "Save this search"
3. Choose how you want to be notified: eBay's help pages list the eBay app, email, and SMS as options
4. For push, allow eBay notifications on your phone and in the app's notification settings
Limitations:
- ❌ Notification timing isn't published, and email alerts can bundle several listings
- ❌ Auction vs Buy It Now may need separate searches
- ❌ Not great for local pickup deals
Best for: Collectors tracking rare items over weeks/months
The Problem with Native Alerts
Native platform alerts have three real drawbacks:
1. Timing You Can't See
No marketplace publishes how often it checks your saved searches or how quickly alerts go out, and some bundle matches into emails. You can't tell whether an alert is minutes or hours behind the listing, so you can't plan around it.
2. No Cross-Marketplace Monitoring
You need to:
- Set up separate searches on 10 different apps
- Check 10 different notification streams
- Manually compare prices across platforms
- Juggle 10 different messaging systems
The cost: Time spent every day just managing alerts across platforms.
3. Different Rules on Every App
Each marketplace has its own filters, its own saved-search screen, and its own idea of what a keyword match is. Most don't support exclusion keywords at all, so a search for a camera also alerts you about empty boxes, straps, and manuals.
Automated Multi-Marketplace Alerts
Third-party automation tools address several native alert limitations.
What Automation Provides:
Automatic rechecking:
- Your saved searches are checked on a schedule, without you opening any app
- Push notifications to your phone when a new listing matches
- Overnight and weekend listings still get picked up
Cross-marketplace search:
- One saved search can cover several marketplaces at once
- Results from every marketplace in one view
- Single notification stream (no app juggling)
Better filtering:
- Exclusion keywords ("box", "parts", "manual")
- AND / OR keyword rules
- Price ranges and distance filters
How DealHunter Works
DealHunter searches Facebook Marketplace, OfferUp, Mercari, Poshmark, Craigslist, Depop, eBay, Vinted, Whatnot, and AutoTrader for you. It rechecks your saved searches automatically and sends a push notification (or email) when a new listing matches; how often each search is checked depends on your plan (see pricing).
Setup process:
1. Create an account at dealhunter.io
2. Add search criteria (keywords, price range, and ZIP code + radius for Facebook, OfferUp, and Craigslist)
3. Add exclusion keywords, excluded sellers, or excluded locations
4. Enable push notifications (web push or the iOS/Android app)
5. Get notified when matching listings appear
Key features:
- ✅ Pick any of the 10 supported marketplaces for each saved search
- ✅ Keyword rules: comma = AND, pipe | = OR, 16..32 = numeric range (e.g. kitchenaid,mixer|stand mixer)
- ✅ Exclusion keywords, excluded sellers, and excluded locations
- ✅ One results feed across marketplaces, showing each listing's price
- ✅ AI search assist that turns a plain-English description into a search
- ✅ Push notifications on web, iOS, and Android, plus email
Try free: Get Started Free
How to Create Effective Search Criteria
Bad search criteria = notification spam. Good criteria = high-value deals only.
Start Broad, Then Narrow
Example progression:
Too narrow (you'll rarely see a match):
Herman Miller Aeron chair size B graphite color remastered 2022 model
Too broad (a flood of mostly irrelevant results):
chair
Just right (a manageable number of relevant results):
Keywords: herman miller,chair
Price: $200 - $700
Radius: 40 miles
Exclusion keywords: poster, book, parts, replica
Use Exclusion Keywords Aggressively
Exclusion keywords filter out junk without narrowing too much.
Example - Searching for cameras:
Keywords: canon,camera
Exclusion keywords: box, strap, manual, case, bag, lens cap
This eliminates:
- Empty boxes being sold separately
- Accessories without the camera
- Manuals/documentation only
Example - Searching for sneakers:
Keywords: nike,jordan 1
Exclusion keywords: laces, box, custom, replica, inspired
Set Strategic Price Ranges
Price filters are your secret weapon for finding underpriced items.
A rule of thumb:
Set your max price well below typical resale value; many flippers aim for no more than about 60% of what the item usually sells for. If similar items sell for around $500, a max of about $300 catches:
- Sellers who don't know the value
- Motivated sellers pricing for quick sale
- Pricing mistakes (typos)
Work out "typical resale value" from recent sold listings for the exact model, not from asking prices or retail.
Don't filter from $0: Scam and placeholder listings are often priced at a few dollars. Setting a sensible minimum for the category removes most of them.
Geographic Strategy
Distance matters for competition and gas costs.
How to think about radius:
- Close to home: More buyers nearby, but the most convenient pickups
- A short drive out: Fewer people willing to make the trip
- Further out: Worth it for high-value items
- Far away: Batch several pickups into one trip
Strategy: Set alerts at multiple distances:
- Primary: a tight radius for everyday items
- Secondary: a wider radius for high-value items
- Tertiary: a very wide radius for rare finds worth a road trip
Alert Frequency and Timing Strategy
Too many alerts = notification fatigue. Too few = missed deals.
Prioritize by Value
High-value items ($200+):
- Push notifications on
- Check as soon as you can (sellers often go with the first serious buyer)
- Example: Electronics, furniture, tools
Medium-value items ($50-200):
- Push notifications on, but tighter criteria
- Check when convenient during the day
- Example: Clothing, home goods, kitchenware
Low-value items (<$50):
- Rely on email, or browse the results feed when you have time
- Review at your convenience
- Example: Books, accessories, small decor
When to Pay Attention
Marketplaces don't publish when sellers post most. Rather than trusting a "peak hours" chart, let your saved searches do the watching and keep notifications on for the searches that matter most. If you notice your own searches tend to light up at certain times, plan around what you actually see.
Managing Alert Fatigue
Too many notifications → disable alerts → miss deals. Here's how to avoid burnout:
Start Small, Scale Up
Week 1: Set up 3-5 core searches (your highest-priority items)
Week 2: Add 3-5 more if you're handling volume well
Week 3: Add geographic variations or related categories
Week 4: Optimize (pause underperforming, add new high-value searches)
Keep Push for What Matters
Don't turn on push for everything.
Push on:
- High-value items you'd drive a long way for
- Rare collectibles you've been hunting for months
- Items with immediate resale profit potential
Email or browse later:
- Medium-value items you'd like but don't need urgently
- Exploratory searches (testing new categories)
- Seasonal items (patio furniture in fall, snow blowers in spring)
Review and Prune Weekly
Every Sunday, review your searches:
- Pause searches with 0 quality matches in 2 weeks
- Tighten criteria on searches that send mostly junk
- Add exclusion keywords based on spam patterns
- Adjust price ranges based on recent sold prices
Set Quiet Hours
Use your phone's own Do Not Disturb or Focus schedule for sleep and work. In DealHunter you can also snooze push notifications for a single noisy search for 1, 8, or 24 hours instead of turning everything off.
FAQ
How many deal alerts should I set up?
Start with a handful of high-priority searches and add more only when you're keeping up with the matches you already get. How many saved searches you can run in DealHunter depends on your plan (see pricing).
What's the best notification method?
Push notifications are the hardest to miss. Email works for low-priority searches you review once in a while.
How do I avoid scams in deal alerts?
Use exclusion keywords ("replica", "inspired"), exclude sellers you've had problems with, check the seller's profile and ratings on the marketplace, ask for extra photos, and meet in public places for local deals.
Can I set up alerts for multiple cities?
Yes, but you'll need separate searches per city on most platforms, including DealHunter: each saved search uses one ZIP code and radius for the local marketplaces.
Should I turn on push for every search?
No. Keep push for high-value or competitive categories (electronics, furniture), and review low-priority or exploratory searches by email or in the results feed.
Conclusion
Deal alerts are the most reliable way to keep up with a fast-moving secondhand market. Manual checking works for casual browsing, but if you're serious about finding deals, you need automation.
Key takeaways:
- Native platform alerts don't publish their timing, and each app works differently
- Cross-marketplace monitoring requires juggling 10 different apps manually
- Effective search criteria use exclusion keywords and strategic price ranges
- Alert fatigue is real—start small and scale intentionally
Managing alerts by hand across several apps eats time every day. An automation tool turns that into a few minutes of setup plus notifications when matching listings appear.
Related Guides
- Facebook Marketplace Alerts That Actually Work - How to get dependable Facebook Marketplace notifications for the items you want
- How to Set Up Poshmark Alerts for Designer Items - Track luxury fashion deals on Poshmark
- Best Times to Check OfferUp for New Listings - When to check OfferUp for local deals
- Deal Hunting Automation - Automate your deal hunting workflow across marketplaces
Ready to stop missing deals? Try DealHunter free and search 10 marketplaces from one saved search: Get Started Free