Northern Tool offers the Mr. Heater Big Maxx Natural Gas Garage/Workshop Unit Heater for $332.99. Coupon code "255830" drops it to $312.99. Opt for in-store pickup to avoid the $38.99 shipping charge. That's $26 below our mention from two weeks ago and the lowest price we've seen. (It's the best deal now by $81.) It can be vented horizontally or vertically and requires a venting kit. Coupon ends November 22.