UPDATE: 12/21 12:15 PM EST: No longer available again.
Reader Tessa let me know that this coupon just worked for her so if you missed it yesterday you can now print it. But hurry!
Here is a hot new coupon for $1/1 Diet Coke 14 oz, 16 oz or 20 oz. This should make for free most places.
(thanks Tessa!)