Comparison Shopping Engines are gold when it comes to product research. They’re filled with all the information you need to make your buying decision, especially if its the lowest price you’re after. Product feeds that adhere’s to specific data structures that Google, Yahoo, PriceGrabber, TheFind, etc is all you really need and they’ll do the rest; some are free like Google & Yahoo, but some are not like PriceGrabber and TheFind – Upload it and let it do it’s thing.