Electronic City via eBay offers the third-generation Nest Learning Thermostat, model no. T3007ES, for $199.99 with free shipping. That's $5 under our mention from March and the lowest total outright price we've seen. (it's also a current best by $37.) It improves on its predecessor with a slimmer profile and bigger display. 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.