Walmart offers the Intex Queen 18" Dura-Beam Standard Raised Pillow Rest Airbed Mattress for $34.88. Pad your order over $35 to bag free shipping; otherwise, it adds $5.99. (In-store pickup is also available.) Excluding padding, that's $4 off list and the lowest price we could find. It features a flocked sleeping surface, built-in pillow, and 3-in-1 valve.