"Product" engines let advertisers provide "feeds" of their product databases and when users search for a product, the links to the different advertisers for that particular product appear, giving more prominence to advertisers who pay more, but letting the user sort by price to see the lowest priced product and then click on it to buy. These engines are also called Product comparison engines or Price comparison engines.
Some Online Comparison Shopping engines such as Shopping.com use a PPC model and have a defined rate card. Whereas others such as Google Product Search, part of Google Base (previously known as Froogle) do not charge any type of fee for the listing but still require an active product feed to function.
Noteworthy PPC Product search engines include: Shopzilla, NextTag, and Shopping.com.
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