DirectoryBest.com offer directory of directory website links to browse for computers, software, employment, finance, reference, education, arts, craft and real estate.
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BestBookBuys.com
Find new and used books by searching dozens of bookstores with 1 click. http://www.bestbookbuys.com/
BigWords.com
Textbook price comparison search engine. New and used textbook prices and textbook buyback prices.
abebooks
Specializes in connecting buyers and sellers of used, rare, and out-of-print books. Includes a database of booksellers' inventory lists searchable by author, title, publisher, and keyword.
Bibliopoly
Offers a searchable, multilingual database of antiquarian booksellers, rare editions, manuscripts, and more.
BookBrain
Online price comparison service for U.K. book sites.
ISBN Search
Price compare and search for books by ISBN on all major online bookstores.
