The ActiveShopper service will be integrated with other Infospace products, which include maps, phone directories, and classified ads. Infospace's cobranded content is available on about 1,500 sites including America Online, Netscape and go2net.
Infospace's ActiveShopper service will include a range of product data beyond price comparisons. It will also alert them about sale prices and auctions, point to reviews and discussion groups that focus on the product, and tell them if the product is available from catalog or traditional retailers.
"Our goal is to do the same thing with commerce as we did with content," said Infospace Chief Executive Naveen Jain.
Analysts say Jain's concept of packaging and selling content is likely to become increasingly popular as Web sites and service providers turn to third parties to expand their offerings in an effort to keep users from surfing off into other domains.
"Let's face it, the big portal guys can't specialize in everything," said analyst Peggy Ledvina of Dain Rauscher Wessels. "Why not cut a deal with someone who can supply the content they need?"
Reuters contributed to this story.