I'm not sure if they have ISBNs, but if they do, type them into "allbookstores.com" and use their search. They compile a net-wide search of all book sellers who have that isbn listed. Ebay and amazon obviously, but also tons of other book sellers that you've never heard of. I discovered that site back in the stone ages (college, ha) and saved a ton of money on text books, but I still use it occasionally to this day if I'm looking for a book.
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