Half.com is a subsidiary of eBay, in which sellers offer items at fixed prices, usually items that have a UPC, ISBN or other kind of SKU, rather than rare, old or collectible items. There are no fees to list items on Half.com, but rather the company takes a commission of every completed sale. As of June 2005, this commission is 15% of the first $50 worth of combined selling price and shipping costs, 12.5% of the next $50, 10% of the next $150, 7.5% of the next $250, and 5% of the rest.

Half.com was founded in 1999 by American entrepreneur Joshua Koppelman (Infonautics, Turntide, Comcast Interactive Capital). As an advertising gimmick, the company paid the town of Halfway, Oregon $100,000 and 20 new computers to change its name to Half.com, Oregon.

Some of the recent popular items for sale: Battlefield 2: Modern Combat, Lara Croft Tomb Raider: Legend, Grand Theft Auto: San Andreas, Halo 2 and Madden NFL 2006

eBay purchased Half.com in 2000 for roughly $350 million, integrating its user management system: buyer/seller feedback and account information are routed through eBay. Like its parent company, Half.com is not a retail site, and has no physical stock or inventory.

Rather, the site offers a place for individual sellers to list their items and potential buyers a central location to in which to view them, offering both a standardized transaction and money exchange process. Unlike its parent, Half.com is not an auction site: sellers offer their wares at fixed prices. Like Amazon.com, Half.com plays a large role in the used textbook market.