DealYard via eBay offers the Sunbeam Royal Mink Chill-Away Heated Wrap in three colors (Lavender pictured) for $29.97 with free shipping. (Amazon charges the same.) That's the lowest price we could find by $19. This machine-washable wrap measures 25" x 57" and features three heat-settings and 3-hour auto-off.

Update: The price has increased at DealYard via eBay; however, Amazon still offers it for the same price.