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Amazon offers Prime members the Sunbeam Quilted Polyester Heated Twin Mattress Pad with EasySet Pro Controller, model no. MSU3GTS-P000-12A00, for $ 34.99 with free shipping. (Non-Prime members can spend $ 35 or more to qualify for free shipping; otherwise, shipping adds $ 8.83.). It’s machine-washable and features 10 heat settings and a 10-hour auto-off function.