- A-albionic Universal Book Service
 - Rare, out-of-print, in-print. - Abebooks.com
- Specialises 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.
- ABooksearch.com
- Offers out of print, old, and rare books direct from booksellers.
- Abracadabra Booksearch International
- Locating those hard-to-find books and completing collections.
- Alibris
- Sells used books, used textbooks, and rare, out-of-print books from a worldwide network of independent booksellers.
- Ashworth Books
- Dealer in out-of-print, scarce, rare, and antiquarian books on all subjects.
- Biblio.com
- Online bookstore offering used, rare, out-of-print, and hard-to-find books from professional, independent booksellers worldwide. Includes a section for textbooks.
- Bibliofind
- Amazon.com book search service. Searches inventories of old, used, and rare booksellers around the world.
- bibliophile.net
- Multilingual book search engine, with links to dealers.
- Bibliopoly
- Offers a searchable, multilingual database of antiquarian booksellers, rare editions, manuscripts, and more.
- Book Look
- Online bookshop and search service.
- Book Wormer
- Provides an online bookstore comparison shopping engine to find books at the cheapest prices.
- Bookfinder-General
- The search is free.
- BookFinder.com Report
- Enabling individuals, libraries, and book dealers to track down and purchase books, new or used, in or out of print, rare or readily available.
- BookSearch
- Rare and out-of-print book search service. Initiate a search by phone, fax, letter, or email.
- Booksearch at Hay
- Specialising in finding used and antiquarian books both online and through book dealers.
- Bookworld
- International book search service - no fees, no obligation.
- CampusBooks.com
- Finds the lowest price for new or used college textbooks across the web. Search for textbooks by name or ISBN, or sell your used textbooks.
- ChooseBooks.com
- Brings book buyers and sellers together. Features new, used, rare, and out-of-print titles from independent booksellers from around the world.
- E-Yearbook.com
- The largest collection of old high school, college, and military yearbooks on the Internet. Subscribers can view yearbooks online with a portion of the revenue going to support schools.
- Ezra the Bookfinder / Aardvark Booksearch
- Locating out-of-print, rare, and collectable books.
- Good Book Guide
- Locates and sells books published in the United Kingdom.
- H.P. Bookfinders
- Out-of-print bookfinding service.
- ISBNdb.com
- Provides a book research engine and price comparison tool, taking data from public and academic libraries from across the world.
- LawBookFinder
- Searches specifically for law books, textbooks, casebooks, study aids, and legal career books.
- Omicron Inforium, The
- Used by persons with scholarly interests to locate information about books; booknotes are provided by our speciality booksellers.
- OutofPrint.com
- Web-based book search service.
- Skriptoriet
- International search service for antiquarian and put-of-print books.
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