Amazon offers Prime members the AZ Patio Heaters Portable Glass Tube Patio Heater in Stainless Steel, model no. HLDS032-GTTSS, for $24.44 with free shipping. (Non-members can spend $49 to qualify for free shipping; otherwise, shipping costs $13.47.) That's the lowest total price we could find by $10 and the best price we've seen. (For further comparison most charge $60 or more.) It features 10,000 BTUs of heating power.