We have had them here in MSP for like 1 1/2 years and there used to be a TON of codes like FREE, DVD, Cheeseburger, Hamburger, JOHN, and many more all were tied to a credit card. So I had like 50 free rentals.
The best one ever was "Supersize Me" (you know the one that shows how bad eating Mcdonalds everyday is.)