Amazon offers the 2nd-generation Ecobee Ecobee3 Wireless Thermostat with Remote Sensor for $186.32 with free shipping. That's $4 under our mention from three days ago, since expired, and the lowest price we've seen. (It's a current low by $14.) It includes one remote sensor (with support for up to 32), which can track temperatures across your home for more accurate temperature settings. It also features a color touchscreen, timer, and remote control smartphone app.