- Americana Exchange
 - Resource for collectible and antiquarian books including worldwide book auction listings and calendar and an extensive bibliographical database of antique books. - Antiquarian Books in Scandinavia
- Allows users to search the inventories of Scandinavian antiquarian booksellers.
- Antiquarian Booksellers Association of America
- Promotes ethical standards and professionalism in trade, encourages collecting and preservation, supports research into the study of antiquarian books, and facilitates collegial relations.
- Bibliocity
- Features searching, online ordering, and automatic handling of wants.
- Bibliofind
- Amazon.com book search service. Searches inventories of old, used, and rare booksellers around the world.
- Bibliopoly
- Offers a searchable, multilingual database of antiquarian booksellers, rare editions, manuscripts, and more.
- Book Sale Finder
- A map to used book sale events, stores, fairs, and more organised by city, state, and date.
- Digital Bibliophile Community
- Database and reference services for booksellers, collectors, and readers.
- JustBooks
- U.K. based marketplace for second-hand and antiquarian books.
- Massachusetts and Rhode Island Antiquarian Booksellers
- Directory of booksellers buying and selling out-of-print and rare books, maps, prints, and ephemera.
- Used Book Central
- Searchable database of stores offering rare, used, and out of print books searchable by author, title, keywords, or price range.
- Used Book Search
- Search for used books worldwide and buy on-line.
- ZVAB - Zentrales Verzeichnis Antiquarischer Buecher
- Search old, rare, and out-of-print books.
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