Northern Tool offers the Campbell Hausfeld 6-Piece Automotive Air Tool Kit for $49.99. Coupon code "254875" drops it to $39.99. Opt for in-store pickup to dodge the $11.49 shipping charge. That's tied with last month's mention as $60 off list and the lowest price we could find. It features a 1/2" impact wrench, 3/8" air ratchet, air hammer, two chisel bits, and retainer spring. Deal ends October 17.