I am interested in integrating a comparison shopping engine into a new site that I am developing. Can someone point me in the right direction? I would like some sort of API that I can access. What are the trusted programs out there. I'm looking for something like www.shopping.com, www.bizrate.com/www.shopzilla.com, www.pricegrabber.com, etc. I've heard people mention that they are shopping.com affiliates but I can't find a signup form. Thanks everyone.