I'm not quite sure what the freebie is, but Starbucks is having a sampling event in store for the next three days--January 12, 13, and 14. You can read the details HERE, but they will also have some freebie. They'll want you to vote for your favorite on this page.
I'm not sure if this will work for you, but Cocoon is giving away $5 Starbucks gift cards. Just register for an account, and they will send the code to your email.
**I haven't received my code yet, but it's worth a shot.