DeWalt DC820KA 18-Volt 1/2" Compact Impact Wrench for $187.00 shipped.  Here is a screenshot for your reference.  It features 1,740-inch-lbs. of turning force at 4.6 lbs, frameless motor with replaceable brushes, all-metal transmission, two 18-Volt XRP batteries, one-hour charger and storage case.  Most places have it for over $250.