Go HERE to print a coupon for a BOGO Free CVS coupon for 20 oz Diet Coke or Caffeine-free Diet Coke. It is a store coupon, so it can not be used anywhere else. I also saw something interesting on their cooler window today where the Cokes are kept. There was a sign saying that if you buy 9 Cokes, your 10th one is free. I assume that they are tracked by your ExtraCare Card. Sounds like a good deal for those who like to purchase the cold single-serving bottles.