PriceCheckah: Check Prices Across Web Retailers While You’re Out

Price Checkah is a handy iPhone application that lets you compare product prices across major online retailers including Amazon, Overstock, eBay etc. While it seems to be designed specifically for iPhone it can be accessed from pretty much any other web-enabled mobile phone as well.

To get product prices you may use the item ISBN or UPC code, or search by product brand and name.

Features

Check and compare prices across online retail sites while shopping out.
Check prices using ISBN, UPC codes, or keywords.
Supported sites: Amazon, Overstock, Walmart, eBay & Buy.com
Customize your search results, sort results by country, retailers, include/cancel pictures etc.
No registration needed (you only need to if you want to keep track of all your searches).