In all advertisements, offers for sale, or sales involving two (2) or more items, at least one (1) of which items is cigarettes, at a combined price, and in all advertisements, offers for sale, or sales involving the giving of any concession of any kind whatsoever (whether coupons or otherwise), the retailer's selling price shall not be below the cost to the retailer of all articles, products, commodities, and concessions included in such transactions.