Emerson Thermostats via Newegg offers the Emerson Sensi Smart WiFi Digital Thermostat for $100. Apply coupon code "MPBTS17" and check out with MasterPass to cut the price to $90. With free shipping, that's a $9 drop from yesterday and the lowest price we could find by $34. This thermostat works with Amazon's Alexa-enabled devices via voice control and allows for WiFi control via Emerson's iOS or Android app. It requires two AA batteries (included). Deal ends August 18.

Note: This coupon can only be used once per account.