Smarthome offers the Insteon Remote Control Wall Thermostat, model no. 2441TH, for $69.95. Coupon code "E16THR39" cuts it to $39.99. With $6.06 for shipping, that's the lowest total price we could find by $32. It can be controlled from your smartphone or tablet via the Insteon Hub app and works with HomeKit technology. Deal ends September 29.