Best Buy via eBay offers the 2nd-generation Ecobee Ecobee3 Wireless Thermostat with Remote Sensor for $184.99. Apply coupon code "P20MEMDAY" and checkout with PayPal to cut it to $147.99. With free shipping, that's $28 under our mention from two weeks ago and the lowest price we've seen. (It's the best deal now by $11.) It includes one remote sensor (with support for up to 32), which can track temperatures across your home for more accurate temperature settings. It also features a color touchscreen, timer, and remote control smartphone app. Deal ends May 29.

Note: This coupon can only be used once per PayPal account within a single transaction.