Amazon offers the White-Rodgers Emerson Sensi WiFi Pro-Install Thermostat, model no. 1F86U-42WF, for $125.19. Clip the $20 off coupon on the product page to cut it to $105.19. With free shipping, that's the lowest total price we could find by $45, although two weeks ago we saw the DIY-install version for $15 less. (The DIY-version includes retail packaging, a 3-year warranty, and a more comprehensive installation guide; however, the Pro-version comes with a 5-year warranty.) This thermostat allows for WiFi control via Emerson's iOS and Android app. It requires two AA batteries (included).