In connection with the AA 25 mi bonus I've been cheking out some spots I'll be traveling to in June - in the hope of buying giftcards or certs for use back home as suggested above re: Burger King. In any case, I see that there's a Quizno's in Sunny Isles, FL and an IHOP in Bonita Springs that participate.
Unfortunately the Dunkin Donuts locations don't sell giftcards or certs. That's a major bummer as I could have definitely used those (we buy their packaged coffee for use year 'round).