ngc34 via eBay offers the Milwaukee 18-volt Cordless 1/4" Hex Impact Driver for $50.99 with free shipping. That's the lowest price we could find by $48, outside of the mention below. It features overload protection, LED light, and belt clip. A battery is not included.

A close price: Davidstoolsandmore via eBay has it for $51.99 with free shipping.