Hardcore deal seekers will want to download all five apps. But if you don’t want to spend the time scanning barcodes five times, at least download these three: Google Shopper, Amazon Mobile and RedLaser. Google Shopper saved Pisani $18, the most of the bunch. Amazon’s came in a close second. RedLaser’s price was just a dollar less than Bed, Bath and Beyond’s, but the app has more features than others.