Found this in recent issue of Cosmopolitan, free sample of energy drink thing, not sure how much drink you get though, the name shot makes it sound like not much!
Edit to say you have to sign up for the mailing list for it to accept your submission
(even known it says you are not successful like they said i was not. i still got 1 in teh mail 2 weeks later )
just give it a try worked for me