ZebraScan is a free UPC/EAN barcode scanner for Nokia phones. It will look up the product name so you can access product and price information right at the store.
Don't get home and be upset about your purchase - be a smart shopper
If you don't have a Nokia N-Series phone you can always use the MobileWeb version. Lookup barcodes right from your phone browser and connect to product and price information from any web enabled phone