Shopsavvy works for me, too. I believe they've recently updated it to allow scanning of QR codes, so I decided to use it exclusively (though Barcode scanner was fine, too).
Funny thing is, I don't bother scanning products like Soda, because I'm unlikely to drive far enough to make the difference in cost worth the time. For higher priced items, such as the aformentioned electronics and such, or office products, I've found it useful.
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