As one of its daily deals, Best Buy via eBay offers the SimpliSafe Defend Home Security System
in White, model no. BBY-DEF11-00, for $269.99
with free shipping
. That's $80 off list and the best deal we could find. It comes with a base station, keypad, four entry sensors, two motion sensors, a panic button, smoke detector, Keychain remote, and yard sign. It features an operating range of 400 feet, and is compatible with Windows, Mac, iOS, and Android. Deal ends today.
Note: By default, this system is not monitored by a security company. However, plans start at $14.99/month with no contract required.