Burger King is letting you decide how you want its ever-changing “2 for $5″ promo. For a limited time, mix and match two sandwiches for $5. Choose from the Original Chicken Sandwich, Big Fish, Big King and Extra Long BBQ Cheeseburger. Of course, you must purchase two to get the discount. (If not, you’ll pay full price. With some of the sandwiches costing around $4, why not buy two?) At this price, if you’re really hungry, you might be able to eat two — just skip the fries and soda. Or, better yet, treat a friend. The line-up changes every few months, so check the menu first for the special before ordering.