Walmart offers the Optimus 1,500-watt Electric Portable Fan Heater, model no. H-1321, for $15 plus 97 cents for shipping. (Free Site-to-Store is also available.) That's the lowest total price we could find by $4. Sales tax is added where applicable. The heater measures 9" x 5" x 11" and features a control knob, two heat settings, fan-only option, thermostat, carry handle, and more.