Home Depot offers the 2nd-generation Ecobee Ecobee3 Wireless Thermostat with Remote Sensor, model no. EB-STATE3-02, for $199 with free shipping. (Amazon has it for the same.) That's the lowest total price we could find now by $41, although we saw it for $9 less three weeks ago. It includes one remote sensor (with support for up to 32), which track temperatures across your home, and adjusts temperatures accordingly. It also features a color touchscreen, timer, and remote control smartphone app.