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A reward card system would work well. After you buy your eight sandwiches, they could either send you a more secure coupon (hologram, bar code, or something tied to the card). Or, just keep a system where you can track after they slide your card.
"Oh, Jared, you have purchased eight sandwiches, there isn't a charge today."
It's pretty simple. The best part is they can track what sandwiches you buy and what others are buying.
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