We got them at the little store by Pepper Market, the name escapes me right now. Not the walk up window, but on the other side of Pepper Market.
My DH asked what was available for snacks on the dining plan and they got out at sheet with everything listed. I know there was at least one other person for here that had trouble with the snacks but we didnt. We got the rice crispie treats, Famous Amos cookies, bottles of Coke, Sprite and water, and we bought some kids ice cream bars with our left over snack credits.
And the rice crispie treats are huge. On the plane home our DD kept asking for the rice crispie brick lol.