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by mcguire 2600 days ago
Last fall, Amazon shut down access to (one of?) their ISBN lookup service, unless you sold enough things from their advertising.

I've been using Tellico (http://tellico-project.org/) and a barcode scanner for many years and it works well. That's just for about 3,000-4,000 books, though. One of the other lookup options works. (ISBNSearch.org?)