Iowa Code § 218.98: Canteen maintained.

A canteen may be maintained at any institution for sale to persons residing in the institution of items including but not limited to toilet articles, candy, tobacco products, notions, and other sundries, and the necessary facilities, equipment, personnel, and merchandise for such sale may be provided. The department shall specify what commodities will be sold in the canteen. The department may establish and maintain a permanent operating fund for each canteen. The fund shall consist of the receipts from the sale of commodities at the canteen.