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