Walmart.com drops the price of the Mainstays Twin-Over-Twin Wooden Bunk Beds in Honey Pine (pictured), Cherry, and Espresso, from $189 to $159. Shipping adds $14.97, or you can opt for free Site-to-Store shipping and pick it up at your local Walmart. Even with the shipping cost that is $15 off of list and the lowest price we could find for twin-over-twin bunk beds. These bunks feature a wood slat system intended for coil-spring mattresses, come with standard guard rails, and can easily be converted to two twin beds. Sales tax is charged in most states.