While it’s not travel related, Starbucks does have a loyalty program and this is a good deal, so I figured I’d mention it. Through June 18, My Starbucks Rewards members can receive a free tall iced beverage (including frappuccinos) at locations in the US and Canada. Simply show this coupon, either on your mobile device or printed, and pay with your My Starbucks Rewards card (though it shouldn’t actually be charged). There’s a limit of one free drink per member.
Aside from the free drinks for birthdays and 12 transactions it’s rare to see an offer like this, in my experience.
Update: It appears this may be targeted, so check your My Starbucks Rewards account to verify eligibility, as there seem to be some other versions of the offer out there as well.