Sellers pay a monthly subscription to list their books on the site, ranging from $25 to $300, depending on how many books they list. In addition, sellers pay a percentage fee for each book sold via the websites.
AbeBooks initially offered its services for a flat listings fee, based on the number of titles listed for sale. The model was changed in the early 2000s to include a commission on sales. In April 2006, AbeBooks started mandatory processing of Mastercard and Visa credit card transactions on behalf of its sellers and added a charge of between 3.5% and 5% for the provision of this service: previously this service had been optional. In 2008, AbeBooks started charging a commission of 8% on the cost of postage as well as the book price.
Sellers can, within limits, set their own standard postage rates to various countries or by different carriers. Booksellers can upload their inventory using their own spreadsheet software or via the site's interface. Items that sell are mailed directly from the individual bookseller's location. Some booksellers have new books directly mailed from wholesalers or publishers.
While AbeBooks is arguably the largest such site, most booksellers who list on AbeBooks also list their books on multiple competing marketplaces such as Amazon.com, Biblio.com, Half.com etc. Prices of the same book from the same seller may differ on these sites (due to variations in currency exchange rates, discounts sellers may choose to offer through other sites, or mark-ups some sites may add), however there are a number of 'comparison sites', notably Addall.com and Bookfinder.com.