Northern Tool discounts over 500 heaters, fuel, and accessories during its Heater Pre-Season Sale, with prices starting from $5.99. Plus, get an extra $10 off orders of $50 or more via coupon code "255831" or an extra $20 off orders of $100 or more via coupon code "255830". Where available, opt for in-store pickup to avoid shipping costs, which start at $5.99. (Free shipping is available for select items.) Coupons expire November 22. A couple of best bets: