Best Buy offers the Samsung SmartThings Home Monitoring Kit, model no. F-MON-KIT-1, for $199.99 with free shipping. (Amazon, Samsung, and Sears charge the same or a buck more.) That's the lowest total price we could find by $34. This kit allows you to control and monitor your home via your smartphone. It includes a SmartThings Hub, motion sensor, two multipurpose sensors, and a smart outlet.
Update: Amazon and Samsung have dropped their prices by $1.