Woot offers Craftsman CMCF810C2 V20 Max Impact Driver, Cordless, Variable Speed Trigger 2,800-3,500 RPM for $89.99 (orig. $153). Free shipping for Prime Members.

Product Description:
V20* Cordless Brushless 1/4-in. Impact Driver (2 Batteries) highlights a brushless motor giving the user up to 30% more run time increasing the torque and speed allowing for added ease while driving large fasteners. The Impact Driver is built with the user in mind allowing easy bit changes and providing maximum control during application. 

• HIGH PERFORMANCE: Brushless motors provide up to 30% more runtime** and delivers 1,500 in-lbs. of torque
• QUICK FASTENING: Max 2,800 RPM and 3,500 IPM
• QUICK AND EASY: Quickly release chuck for easy one-handed bit changes