ISBN.nu
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ISBN.nu is a website that allows you to search a vast titles database (of mostly U.S. in-print and out-of-print titles) using title words, author's name, subject, any combination of those three, or ISBN. It is owned by freelance journalist Glenn Fleishman and began its life as a "proof of concept" project. Its database is created from information licensed from the Informata division of Baker & Taylor and now comprises over 3 million entries. When queried on a particular book, the site presents the prices, availability, and shipping time of about a dozen online bookstores. The site makes its revenues through commissions when books are purchased through links to those stores.