Walmart offers the Comfort Zone 5 1,500-watt 120-BTU Electric Radiant Space Heater in Gray, model no. CZ530WM, for $16. Opt for in-store pickup to avoid the $4.97 shipping charge. That's $14 off list and the lowest price we could find. It features an adjustable thermostat, automatic shut-off, and is recommended for rooms up to 170 sq. ft.