I feel a better solution would be a QR code at the bottom that combines each product's UPC and price with the name of the store, date, etc. From there it would be easy to feed that into an app. Whomever created the app could fund it by selling the consumer spending habit data. They could incentivise the app's use by providing analytics, directing consumers to cheaper alternatives and integrating coupons.
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It'll have to be a link to a webpage/API. Thermal printers won't get you good enough resolution to put that much in a QR code for anything but a very small purchase with only a few items.