Northern Tool offers several coupons, as listed below. Plus, each code stacks with sale and clearance items. Shippings starts at $5.99, but free in-store pickup is also available. Some exclusions may apply. Deal ends September 30. The coupons, which do not stack: Spending more than these coupons' minimum purchases? As we mentioned three weeks ago, you can also cut $50 off orders of $250 or more.