How collectors use eBay alerts to fill a want list

Why a want list beats one big search

Most collectors start with a broad saved search like “vintage Star Wars” or “Pokémon PSA 10” and stop reading the updates within a week. A broad search matches hundreds of new listings a day, and the piece you need is one line among them.

A want list works the other way round. Each piece you’re missing becomes its own Spotter, written the way a seller would title that exact piece. You hear about fewer listings, and every alert is worth opening. Each piece also gets its own price ceiling, because a common variant and a scarce one shouldn’t share a budget.

Name each piece by the identifier sellers use

Almost every hobby has a number or code that pins down the exact item. Put it in the item keywords next to the name: careful sellers include it, and it cuts out near-misses.

Sellers don’t all write the same thing. If a card is often listed by player and year without its number, or a sneaker by its nickname instead of its code, make a second Spotter for that wording.

Keep the exact version you want in “Must include”: a grade like PSA 9, a pressing detail like mono, a completeness word like sealed. Every word or phrase in Must include has to appear in the listing, so put alternatives, like two different grades you’d accept, in separate Spotters rather than in the same box.

Let Spotter Otter help write each Spotter

Writing a precise search for every piece on a long want list takes time. Spotter Otter can do much of that work with you:

• Describe it in your own words. Write a sentence like “1986 Fleer Michael Jordan rookie, graded PSA 8, no reprints”, and Luna, Spotter Otter’s AI, turns it into an eBay search and a list of must-haves. You confirm both and set a maximum price, which is required.
• Shop by photo. On a phone, take a photo of the piece, its label or its box, or upload a photo or screenshot. Spotter Otter reads visible names, labels, model numbers and style codes, uses eBay’s image search for clues, and writes a description for you to check before you start. The photo isn’t stored; it’s sent to OpenAI and eBay to identify the item.
• Paste a link. Found an eBay listing for the exact piece, or a store page for a release that sold out? Paste the link to start a Spotter for the same item.

Must-haves are then checked against each listing using the wordings sellers use. A listing that states a different value, like another grade or the wrong size, is left out; one that doesn’t say gets a Maybe, so you can judge it yourself. None of this authenticates or appraises anything. It decides whether a listing describes the piece you asked for.

Set a price ceiling from sold listings

1. Search eBay for the exact piece. Use the same words as your Spotter.
2. Show sold listings only. Turn on the “Sold Items” filter. You now see what people actually paid, not what sellers are asking.
3. Compare like with like. Count only sales of the same version: the same grade, the same completeness, the same pressing, the same size. A PSA 10 and a raw copy of the same card are different items with different prices.
4. Read several recent sales, not the highest. One record sale or one bargain tells you little. If a sold price is shown crossed out, the seller accepted a Best Offer below the price you see.
5. Set your maximum. Use the price you’d pay without a second thought, before shipping, since that’s the price the Spotter compares.

A minimum price can help too. Reproductions, reprints and empty boxes usually sell for a fraction of the real thing, so a floor keeps many of them out. The trade-off is that a floor also hides a genuine piece listed far too cheaply by someone who didn’t know what they had, so keep it low, or leave it off for pieces where that happens.

Keep reproductions, reprints and accessories out

Honest sellers label copies clearly, so one Exclude box removes most of them. Words that work across hobbies:

• Copies: reproduction, repro, reprint, replica, custom, fan made
• Look-alikes: inspired, homage, look-alike, common with watches, bags and sneakers
• Part of the thing: box only, empty box, manual only, case only, dust bag only

Before you save, check that none of your Exclude words appear in the name of the piece itself. And remember Exclude only removes listings that are honest about what they are. A fake described as genuine still gets through, so check the photos, the seller’s feedback and, where eBay offers it, the Authenticity Guarantee badge. Spotter Otter finds listings; it doesn’t authenticate or appraise them.

Auction or Buy It Now

Each Spotter can watch any listing type, Buy It Now only, or auctions only. The two call for different habits.

• Buy It Now listings at a fair price can sell soon after they’re posted. When an alert arrives, check the photos and the seller and decide. Many also accept offers, but while you wait for an answer, someone else can simply buy it.
• Auctions give you days to decide. An alert tells you an auction has started, and the price you see is the opening bid, so a price ceiling on an auction Spotter only filters starting prices. Add the auction to your eBay watch list, work out your top bid from sold listings, and place it once. eBay’s automatic bidding raises your bid only as far as needed, up to your maximum.

Some collectors run both for the same piece: a Buy It Now Spotter with a firm ceiling, and an auction Spotter so they know every time bidding opens on one.

Guides for what you collect

• Trading cards: Pokémon, sports and Magic cards, graded or raw.
• Sneakers: style codes, sizing and replica red flags.
• Vintage clothing: dating a piece by its tags and buying by measurements.
• Retro video games: complete in box, loose, region and reproduction carts.
• Vinyl records: pressings, catalog numbers and condition grades.
• LEGO: retired sets, sealed or complete.
• Watches: reference numbers, box and papers.
• Camera lenses: mounts, versions and used condition.
• Designer handbags: models, sizes and what to check.
• Toys: action figures, Funko Pop and Hot Wheels.