Amazon offers the third-generation Nest Learning Thermostat
in Stainless Steel for $198
with free shipping
. (Home Depot
charges the same; B&H Photo Video
charges a buck more.) That's the lowest price we could find by $2, although we saw it for $49 less last November. Improving on its predecessor with a slimmer profile and bigger display, this thermostat "learns" how you set your home's temperature, downloads data, and can be controlled from your smartphone via WiFi.