Search a title, author, or ISBN once and see prices from a few used-book sites side by side.
Checks AbeBooks, ThriftBooks, and Powell's Books live; Biblio links out directly (see note below).
How this works: each search calls the tool's own worker, which fetches live results from AbeBooks, ThriftBooks, and Powell's the same way a browser would, and calls Powell's own public search API directly. Results are cached for 10 minutes per search term so repeat lookups are fast and don't hammer those sites.
Biblio puts every automated request behind a bot-check page, so BookFinder can't pull live prices from it — the Biblio card always just links to a live search there instead.
These are public search results, not an official price feed from any of these sites, so a result can occasionally come back empty if a site changes its page layout — the direct search link next to each site's name always works as a fallback.