Academic Book Services, Inc.: Grades K-12 reconditioned used textbooks, reference materials, workbooks and paperback titles.
Academic Book Trade: Buy and sell second hand academic and university books.
Bare Bookz: Buys and sells used textbooks; registration required to enter.
Book Swap: College textbooks exchange; student to student sales.
Bookbyte: Sells college and school textbooks.
Bookcircus.com: Used and new textbooks, study aids, dictionaries, encyclopedias, thesauruses, reference materials, classic literature, and bestselling novels for K-12 and college.
Class Book: Used, and some new college textbooks. Buyback service based at East Greenbush, New York.
College Book Service: Offering used textbooks, manuals, discount college as well as university books.
Follett Educational Services: Used textbooks for grades K-12.
Free Book Express: Textbooks and novels, with a 12 site price comparison feature.
Local Texts: Free listings for college textbooks. Search by schools.
PDX Books: Buy and sell college textbooks as well as compare prices at online bookstores.
Powell's Books: Carries an extensive collection of rare out of print used textbooks, reference materials, and technical titles.
StuBex: Book exchange for US and Canadian college students. Registration required.
Texas Book Company.: Sells new and used college textbooks. Includes lists of books by institution.
Textbook Exchange Canada: Buy and sell used textbooks in Canada.
Textbooks For Sale: A selection of used college textbooks.
The Book Cellar: Specializing in college-level technical books and Christian homeschooling curriculum.
The Cat's Pajamas: Offers new and used homeschool materials. Searchable by grade or language.