Northern Tool discounts more than 6,000 items as part of its Warehouse Sale. Plus get an extra $20 off orders of $100 or more via coupon code "257137". Opt for in-store pickup to dodge the shipping fees, which start at $5.99. (Select items receive free shipping.) Some exclusions may apply. Coupon ends May 22. A couple of best bets, with prices after coupon: Don't mind a gift card? Coupon code "259027" bags a $25 Northern Tool Gift Card on orders of $100 or more. (Coupons don't stack, but it yields a stronger discount if you'll be shopping at Northern Tool in the future.)