Northern Tool takes up to $370 off a selection of clearance heaters, stoves, and fireplaces. (Select the "Heaters, Stoves + Fireplaces Clearance" category to see these deals; prices are as marked.) Plus, take an extra $10 off orders of $50 or more via coupon code "252524" or $20 off $100 or more via coupon code "252525". Where available, opt for in-store pickup to avoid shipping costs, which start at $5.99. (Free shipping is available for select items.) Coupons end May 16. A couple of best bets: