[carda]

For regular (not food) shopping: what I've also done with 2nd year Japanese students is make cards of their kind of possessions (MP3 player, bowling ball, kimono, purse, baseball mitt, electronic dictionary, etc.) They first play card "families" to learn the vocab, then they make signs with the regular and sale prices. Then half are shopkeepers and half are customers (rotating). They have to pay cash or by check or by credit card. bogglesworld has the shopping dialogue.

So for food: perhaps the students would like to "buy" the actual cards.