Walmart offers the Modern Sleep Universal Adjustable Metal Bed, model no. 127006-5000, for $34. Opt for in-store pickup to avoid the $5.97 shipping fee. That's the lowest price we could find by $10, although we saw it for $5 less in September. It features seven rug rollers with locking wheels, adjustable sliding end rails, center support bar, and it purports to fit all mattress sizes.