Amazon.com offers the 1st-generation Nest Learning Thermostat, model no. T100577, for $179 with free shipping. That's tied with our mention from five weeks ago as the lowest total price we've seen for a Nest thermostat. (It's also a current price low by $55.) This programmable thermostat "learns" how you set your home's temperature, downloads data and can be controlled from your smartphone (via built-in WiFi), and more.

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