Price Comparison Site

I am looking for a Price comparioson site of consumer goods and services that is Like [Trademark masked].com, [login to view URL] and [login to view URL] with the price streaming capabilities like E-trade.com. The Web site must also have the ability to 1.) Stream consumer prices and services in a Stock ticker like application with the ability of customization from the enduser (Member). 2.) Spider external site for Product information and serices 3.) Web Services friendly application. 4.) Be able toImport XML, CSV, files for merchant product or service information 5.) Notification enabled. So users can recieve Price alerts Please let me know if there are any questions. Thank You. An administration panel inerface must be included as well.