Customer Acquisition: Feed Your Need to Sell

Caveats: Shop.com may not have the brand recognition among consumers that Froogle and Amazon have.

* Shopzilla: (http://www.shopzilla.com) Formerly known as BizRate, this feed relies as much on consumer reviews of products and businesses as on its merchandise selection.

Cost: Cost-per-click. Much like paid search, merchants are charged for every customer who clicks through from the Shopzilla site.