Verizon Wireless offers the 2nd-Generation Nest Learning Thermostat, model no. T200577, for $179.99 with free shipping. That's $20 under our mention from three weeks ago and the lowest total price we've seen. (It's a current low by $39.) It "learns" how you set your home's temperature, downloads data, and can be controlled from your smartphone (via WiFi). Note that not all home HVACs are Nest-compatible; click here to see if it will work with yours.