Wow! While supplies last, Walmart has the Optimum Latex By Sealy Posturepedic Dreams King Mattress for only $490 Shipped! (Reg. $1,169) That’s a steal of a deal. You’ll want to grab this deal now while it’s available. This is different from memory foam, latex foam delivers a consistent feeling across the entire sleeping surface. It provides the initial conforming “body hug” of traditional memory foam, plus a more body-lifting feel.