Iowa Code § 421B.4: Combination sales.

In all offers for sale or sales involving cigarettes and any other item at a combined price, and in all offers for sale or sales involving the giving of any gift or concession of any kind whatsoever, whether it be coupons or otherwise, the wholesaler’s or retailer’s combined selling price shall not be below the cost to the wholesaler or the cost to the retailer, respectively, of the total of all articles, products, commodities, gifts and concessions included in such transactions. If any such articles, products, commodities, gifts, or concessions are not cigarettes, the basic cost thereof shall be determined in the same manner as provided in section 421B.2, subsection 8.