I usually buy my Diet Coke at Costco because they have the best price, unless there is a loss leader at the grocery stores. Lately there have been no big sales at the grocery stores and last week there was a sign in Costco that said, because they were not able to be competitive, they have stopped carrying Coca Cola products. I bought Pepsi instead. Costco is a HUGE retailer. What is Coke thinking if they aren't going to lower their prices for Costco? Is this a bad move? I can drink diet Pepsi. It isn't my favorite but it works.