- World's Largest Source of Out of Print Books - www.abebooks.com
- The Ultimate Source for Out-of-Print & Rare Books - www.alibris.com
- Americana Exchange - www.americanaexchange.com
- AntiquBook: Europe's Premier Antiquarian Booksite - www.antiqbook.com
- Antiquarian Booksellers Association of America - www.abaa.org
- Asian Rare Books - www.erols.com/arbs
- Used, Rare, Out-of-Print, Hard-to-Find Books - www.biblio.com
- bibliofind - www.bibliofind.com
- Bibliology: "The online book fair" - www.bibliology.com
- Biblion.com - www.biblion.com
- BiblioQuest International - www.biblioz.com
- Bookbarn UK: 1,000,000 out of print books in stock - www.bookbarn.co.uk
- BookCrossing.com - www.bookcrossing.com
- BookFinder.com - www.bookfinder.com
- New, Used, Rare & Out of Print Books--Book Search and Price Comparison at 55 Book Stores - www.bookfinder4u.com
- Discount Technical Books - www.bookpool.com
- Books & Book Collecting - www.trussel.com/f_books.htm
- Books on Demand - wwwlib.umi.com/bod/search/basic
- Books in Chinese, English, French, German, Italian, Russian, and Spanish - www.bookswithoutborders.com
- ChooseBooks.com - www.choosebooks.com
- Your Primary Source for Out-of-Print, Rare, and, Used Books - www.elephantbooks.com
- Evenbetter - www.evenbetter.com/books.html
- Great Minds Think a lot - www.fatbrain.com
- International League of Antiquarian Booksellers: Fine and Rare Books, Maps, Prints & Autographs - www.ilab-lila.com
- Joe Schmitz Bookseller specializes in sales to libraries - www.booksite.com/joebookseller
- L'Ex-Libris French used books - www.lexlibris.com
- MidtownScholar Bookstore Harrisburg, PA - www.midtownscholar.com
- The Military Bookman: rare and out-of-print books on military, naval and aviation history - www.militarybookman.com
- PreviouslyPublished.com - www.previouslypublished.com
- Secondhand Book Search - www.searchenginez.com/secondhand
- Servicio Ibérico de Libros Barcelona, Spain - www.servilibros.net
- Tlon Books London, England ,used history books - www.tlon-books.demon.co.uk
- A New World of Used Books - www.21northmain.com
- UsedBookSearch - www.usedbooksearch.co.uk
- A 17th and 18th Century Journey Across the Eastern Frontier - www.wennawoods.com
- ZVAB antiquarian bookseller (Germany) - www.zvab.com
- Works on Personal Finance - www.tntech.edu/history/pfinance.html
