- ComicLink - buy and sell Golden and Silver Age comic books, comic statues, original art, movie posters and more.
- PK Books Online Appraisals - offers online appraisal, auction, and selling services for antique, rare, and used books. Includes classifieds for old books, comics, magazines, and other ephemera.
- Law Book Network - buy and sell new and used law books and related research materials.
- CampusGrind.com - provides online tools to sell and exchange textbooks, music, DVDs, computers, autos, and other items.
- Book Court - lists new and used books for sale.
- ComicBookClassifieds.com - free ads for the buying and selling of comics and related items.
- BIP Comics - multi-vendor platform for selling back issue comics. Items are arranged by publisher, title, and issue.
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