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Walmart.com has the Twin Size Sunbeam Warming Mattress Pad for $29.98. This mattress pad features 10 heat settings, a 10-hour auto-shut off feature and is machine washable and dryer safe. This pad also comes in Full, $34.98, Queen, $39.98 and King, $49.98. Shipping is $.97 and sales tax is charged in most states.