CPO Outlets via eBay offers the DEWALT 1/2" 20-volt Cordless Impact Wrench
(bare tool, no battery), model no. DCF889B, for $129
with free shipping
. That's the lowest total price we could find by $20. It delivers up to 300 foot-pounds of torque, 1,500 rpm, 2,300 IPM, and more. It requires a DEWALT 20-volt battery, sold separately.