nostr:npub1wcuzydjascw8h7f9wr5f6d9z3mw7q8774ess7azvquse9dk70xlq8q9j6s 

I haven't seen anything on a receipt, but I don't really look at those for the ads. I have seen signs outside the stores though. In northern Indiana.

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The top few inches of a Safeway grocery store receipt stating "Free Flu Shots". You'll get 10% off a grocery order with every immunization.

Immunizations are free unless your insurance requires a copay, and restrictions apply.