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Starbucks has a promotion going on currently until 2/7/14 where you will get a free drink by signing up for their My Starbucks Rewards. The only requirement to sign up for their rewards program is that you have a Starbucks gift card. There does not need to be a balance on the gift card, you just need to have one. Personally, I don’t drink coffee so I have not tried this myself, but I haven’t heard of anyone having any issues with this promotion.
If you do not have a gift card, but go to Starbucks often, I would suggest checking checking out Gift Card Granny. They find the cheapest gift cards on all of the gift card sales websites. Right now the cheapest gift card is $8.90 for a $10 gift card, which you could use to register for the free drink. Granted this method costs money, but if you frequent Starbucks, you are basically getting $1.10 and a drink for free.