Northern Tool discounts a selection of heaters, stoves, and fireplaces during its Heater Pre-Season Sale, with prices starting from $5.99. Plus, cut an extra $20 off orders of $100 or more, via coupon code "262564". Where available, opt for in-store pickup to avoid shipping costs, which start at $5.99. (Free shipping is available for select items.) A couple of best bets, with prices after coupon code : ProFusion Heat 15,922-BTU Garage Heater for $109.99 + pickup ($50 off) Mr.