Well I am not sure if this will help you. I can't tell since I never try it myself. It;s really a shopping tool build on top of database.
http://www.sparebrains.com/Shopper.shtml
It seems to have some neat functions.
-New Quotes Page allows you to comparison shop between vendors and keep track of the best prices.
-New Vendors Page allows you to list vendor information in a database for quick reference.