An asking price is a wish. A sold price is evidence — it's what a real buyer actually paid. Before you drive anywhere for a "deal," you can check the ask against that evidence in about five minutes. This is the exact method the LA/OC Deals Digest runs on every listing it publishes, written out so you can use it yourself.
Brand, model number, and variant — the label matters more than the listing title. A Spider Farmer SF2000 with the 301H EVO diodes is a different comp set from a plain SF2000. Note what's included (power cord, hanging hardware, remote) and the claimed condition, and get a photo of the manufacturer's label if the seller will send one. Most bad comparisons start here: same product name, different product.
Search the exact item on eBay, then turn on "Sold items" in the filters (under "Show only") and look at roughly the last 90 days. Ignore active listings completely: they show what sellers hope for, which is the same trap as the Marketplace ask you're trying to test.
Same model and variant, similar condition, same completeness. Throw out the parts-only sale priced like a whole unit, the bundle priced like a single, the one bidding war that doubled the price, and the mislabeled listing. A smaller pile of true comps beats a big pile of almosts.
With ten or more solid comps, the middle of the pile is your anchor, and the range tells you how much condition and luck move the number. With only two or three comps, you don't have a verdict — you have a maybe. Say so, and price your decision accordingly. One exception: a tiny comp set can still kill a deal when the gap is enormous (see the trap example below).
Many eBay sold prices ride on top of shipping the buyer also paid — sometimes $25 or more on bulky gear. A $90 sold comp that cost $115 delivered is not the same evidence as $90 cash in a driveway. For a local pickup, your real cost is the ask plus your drive. Compare like with like.
The spread between ask and typical sold is gross, not profit. eBay fees run about 13%, shipping and packaging come out too if you ship, and so does your time. A deal only counts if a margin survives all of that — and an honest check says so when one doesn't.
Ask meaningfully below the typical sold price, on solid comps, with a margin after costs: worth the drive. Ask at or above the typical sold price: a hard pass, however clean the item looks. Nice photos are not evidence. Prices buyers actually paid are.
From the digest's sample scan of Oct 20, 2026 — real listings and real comps from that week, shown as a worked example of the method. These specific listings are historical and may be sold by now.
Evidence — ~13 recent eBay sold comps
Thirteen comps is a solid pile: the typical price is trustworthy, the range ($34–$150) shows the condition swing, and the ask sits well under the typical sold price even after selling costs. Steps 1–7, passed.
Evidence — 2 eBay sales ever found, both $70
Two comps is thin data — normally a "maybe." But when the ask is five times the only prices anyone has ever paid, thin data is enough. This is the trap the method exists to catch: it looks like pro gear at a serious price, and the evidence says otherwise.
Sold prices are national and in the past. They tell you what buyers paid recently, across the country — not what a specific item will sell for in cash, in your city, this weekend. Local value can run above or below the eBay typical.
Condition is the biggest swing factor, and listings describe it optimistically. Test before you pay, and treat "like new" as a claim to verify, not a fact.
Thin data means "maybe," never "deal." A comparison never guarantees savings, and a sold price never guarantees your sale. What the method does guarantee is that your decision rests on evidence instead of hope.
Take the method with you: Download the one-page buyer checklist (PDF)