With Price Check by Amazon, you can use your iPhone to instantly compare prices with Amazon.com and its merchants while on-the-go. Price Check enables you to search Amazon products quickly using barcode, picture, voice, and text search. All prices are in US Dollars and search the Amazon US catalog. Compatible with iPhone 3Gs and iPhone 4 devices with auto-focus cameras and iOS 4 or greater.
Much like the popular barcode scanning app RedLaser, Price Check lets you “scan” a product’s UPC, which will then display the item in question, along with prices from other online retailers. Another neat feature that is not found on similar apps is the voice search. Simply say the name into the mic and Price Check will do all the heavy lifting. Amazon’s app is free to download, though you’ll need to have an iPhone 3GS/4 to take advantage of the barcode scanning.
Amazon, Price Check by Amazon – Free