12" Memory foam King mattress for $350 OBO. Like new mattress that came with a used Class A motor home RV. Previous owner bought mattress and used only a couple of times, then decided to sell RV due to lack of use. The RV space was only designed for a Queen mattress and the King took up too much space around bed. So, the King was replaced with a Queen. The mattress is in very good condition, see pics.