Written by Jeremy Unruh, Founder & CEO of RarityFinder.
A step-by-step method for finding underpriced items on eBay Buy It Now: sold-comp medians, exact variant matching, fee math, red flags, and alerts.
Choose a collectible category that sells often enough to have reliable recent sold prices.
An item is only underpriced relative to what it actually sells for. Categories with dozens of sales a week — graded cards, popular sealed games, well-known watch references, retired LEGO sets — give you a dependable median. Thin categories with two sales a year give you a guess dressed up as a number.
Filter to Buy It Now listings and sort by newest so you see mispriced listings before other buyers.
Auctions find their own price — the crowd corrects the seller. Buy It Now is where a single seller's mistake stays on the board until someone claims it. The window is usually minutes to hours on popular items, so newest-first matters more than any other sort.
Compare the listing against the median of recent completed sales, ignoring active asking prices.
The most common beginner mistake is comparing a listing to other listings. Active prices are what sellers hope for; sold prices are what buyers paid. Use the median rather than the average so one outlier sale doesn't distort your target.
Confirm set, year, edition, parallel, print run, and grade match before trusting any comparison.
This is where most of the money is won or lost. A holo and a non-holo, a first edition and an unlimited, a PSA 9 and a PSA 10, a box-only lot and a complete-in-box copy — these can be 10x apart and look nearly identical in a thumbnail. If the comp isn't the same thing, the discount isn't real.
Deduct eBay fees, shipping both ways, and any grading cost to see what you actually keep.
A listing at 25% below market is not a 25% profit. Selling fees run roughly 13%, shipping and materials take another chunk, and grading adds cost and months of waiting. A useful rule: if the gap isn't at least 30% before costs, it isn't a flip — it's a favour to the seller.
Read the photos and seller history before buying, not the title.
Underpriced usually has a reason. Sometimes the reason is a seller who doesn't know what they have — that's your deal. Sometimes it's a crease, a reprint, water damage, or a stock photo hiding the real item. Zoom in on corners and edges, look for a photo of the actual item, and check the seller's feedback and return policy.
Buy good deals immediately and set alerts so the next one comes to you.
Genuinely underpriced Buy It Now listings do not survive the day. Once you've validated a search that produces deals, stop running it by hand — put it on an alert so you get notified the moment a new listing clears your score threshold.
A listing is underpriced when its Buy It Now price is meaningfully below the median of recent completed sales for the exact same item, variant, and condition — with enough margin left after fees and shipping to make buying it worthwhile.
For flipping, look for at least 30% below the sold median. Roughly 13% goes to eBay fees, plus shipping, materials, and your time. For adding to a personal collection, a 10–15% discount is already a win.
Active listings show what sellers are asking, not what buyers pay. Asking prices on eBay routinely sit 30–50% above realised prices. Always compare to completed sales.
Three matching sales is the practical minimum, and more is better. With one or two, a single unusual sale sets your entire valuation.
Auctions tend to find fair value because multiple bidders compete. Buy It Now is where one seller's pricing mistake stays visible until someone buys it, which is why RarityFinder focuses on Buy It Now exclusively.
Graded removes condition risk and is easier to price, but carries a premium. Raw can be far cheaper, and if you can assess condition accurately there's extra upside in grading it yourself — at the cost of grading fees and several months.
On popular items, often minutes. On obscure ones, weeks. This is why alerts beat manual searching for any category you hunt regularly.
Yes — that's what it was built for. It scans live Buy It Now listings, pulls sold comps, matches variants strictly, filters out lots and damaged items, and scores every listing 0–100 by profit potential.
Source: live and sold eBay Buy It Now listings and PriceCharting historical sales data, retrieved at the time of search.
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