Craftsman 16882 1/2" Impact Wrench for $24.99.  Order online for in-store pickup at Sears to lock in the price, ensure availability, and save on shipping.  Otherwise, shipping is $8.25 for a total of $33.24 shipped.  Here is a screenshot for your reference. It features a hard-hitting oil-lubricated twin-hammer hammering unit that produces 580 ft/lbs. of torque.