Update [12/2]: Very limited availability for store pickup.

Home Depot has the Ryobi ONE+ 18V Cordless 3-Speed 1/2" Impact Wrench Kit with 4.0 Ah Battery and Charger (P261K1) for $99 with free store/curbside pickup only.

Has 300 ft./lbs. of torque and up to 3,200 impacts per minute.