I live in north Carolina I currently have a BJ's Club membership and the last time I was in there I noticed that they do not sale cake mix, they have brownie mix but no cake mix. I was wondering if the other whole sale clubs Costco or Sam's Club sale cake mix, preferable larger sizes than the now standard  15,25 or 16.5 oz boxes. I currently only have a membership at BJ's but was thinking at getting one at Sam's or Costco as I was thinking one of them might have  a bigger selection of food items than BJs.