For its members only, Costco offers the second-generation Ecobee Ecobee3 Wireless Thermostat with Three Remote Sensors for $169.99 with free shipping. (You must be signed in to see this price.) That's $51 less than the lowest price we could find for the thermostat with just one sensor elsewhere, and the best deal we've seen for this bundle. (We last saw it with one sensor in May for $149; a sensor 2-pack usually costs more than $70.)

This set includes three remote sensors (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.