Staples offers the Driveway Patrol Wireless Home Security Alarm System, model no. 82-3731, for $15.99. Plus, Staples Rewards members qualify for free shipping. (Not a member? Click here to sign up for free.) That's the lowest total price we could find by $6, although we saw it for a buck less a year ago. This wireless, battery-operated system has a 400-foot range and chimes when a person or vehicle passes the sensor. It requires three C batteries and a 9-volt battery, not included. Deal ends August 5.