I recently learned about a cool site called Beat My Price.
It has a "people helping people" type of concept which I like.
Basically you go to their site, enter a product you might purchase online, enter the price, enter the URL for the item, and it is stored in their database. You can look up that item in their database to see if someone else has entered a lower price, if not, your price is stored as the lowest price.
It helps to compare your research with thousands of others who may be researching the same item to help you find the best price for anything you might purchase online.
Pretty cool concept, huh?
Check it out here!