The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Siddharthan Asokan:
Price Match, a simple,easy to use price researcher for the registered trade items, that are sold online. This app is powered using the Semantics3 Product API. The data ranges over a wide number of items. Scan the UPC barcode to find the best price online. Share the best price deals that you find, with your friends. You will never ever have to overpay for the items that you wish to buy.