Methodology

Exactly how every price range, sample size and confidence score is produced. No black boxes.

Data sources

Music: Discogs marketplace lowest live asking prices (per release, GBP).
Everything else: eBay UK live asking prices (Browse API, GBP, used-condition filter first, all conditions as fallback if too few results).
We use asking prices, not sold prices, offline or private data.

Up to 50 live listings are collected per query, filtered to GBP only.
Low = 25th percentile, Typical = median (50th), High = 75th percentile of those prices.
At least 3 usable prices are required for an answer; fewer returns "no data" rather than a guess.
Confidence = min(0.75, 0.30 + n/100) where n is the number of listings used — shown as a percentage.

The top matching releases are looked up and their marketplace lowest prices collected (GBP).
Low/Typical/High = min / median / max of those lowest prices (at least 1 priced release required).
Confidence = min(0.85, 0.35 + 0.15 x priced releases + 0.15 if more than 10 copies are listed, else 0.05).

Prices are re-collected automatically; the daily timer refreshes the oldest 150 non-vinyl pages and the vinyl snapshots, and every search miss is queued immediately.
Answers stay cached for 24 hours (misses for 1 hour). Older cached answers are still served instantly while being refreshed silently in the background.
Each item page shows its snapshot count and last update date.

Showcase grids show one card per title, using the cheapest tracked price.
Full catalog pages (Browse) keep every release/query variant, because those are genuinely different products.
Currency: GBP only. Region focus: UK marketplaces.

We also run the ReusefulShop eBay shop. Items we actually sell become real sold prices — the strongest signal there is.
When a query matches items we have sold, the answer includes sold statistics (median, range, number of sales, date of latest sale).
Privacy: only product fields are imported (title, price, quantity, date, category). No buyer names, addresses or any personal data — ever.
Sold data is fetched automatically from eBay's seller API on a schedule; nothing is entered by hand.

No sold-price claims for eBay data — those are asking prices and are labelled as such in every answer.
No scraping of sites that forbid it; we use official APIs (Discogs, eBay) only.
No personal data: visitor addresses are hashed before they are stored at all.

Spotted a wrong range or stale price? Message us through the ReusefulShop eBay shop — corrections are welcome and taken seriously.