Ring Alarm – Home Security System with optional 24/7 Professional Monitoring – No Contracts – 8 piece kit : $188.98 (lowest price ever, excellent reviews)

This Ring Alarm is the best of conventional alarm systems and new WiFi only alarms rolled into one. It functions out of the box with alerts to your smartphone, but allows you to optionally add central station monitoring (similar to ADT, etc.) for just $10 a month.