Startup Idea: Price Comparison Engine for Online Shopping

Startup idea to develop a website or an app that efficiently compares prices from major online stores like eBay, Amazon, or Newegg. This technology would find the most cost-effective retailer for a chosen product for users which they can use for efficient and economical shopping.

I think it would be really cool if someone could make a website that could compare prices of major online stores to find you the best parts. Specifically something like ebay, amazon or new egg. The app would search the web for the specific product you're looking for and tell you which website offers it for the lowest price. You could probably charge a few dollars for this app.