Home Depot offers the Lux/Geo 7-Day WiFi Programmable Thermostat in Black, model no. GEO-BL-003, for $89.26 with free shipping. That's $15 under our May mention and the lowest total price we could find by $16. It features three power options via microUSB, battery, or C-wire and free iOS and Android application with geo-fencing. Deal ends September 18.