Altatac via Rakuten offers the 3rd-generation Nest Learning Thermostat in White for $202.95. Coupon code "SAVE15" cuts it to $172.51. With free shipping, that's a buck under our mention from a month ago and the lowest price we could find by $36. It "learns" how to set your home's temperature, downloads data, and can be controlled from your smartphone via WiFi. Deal ends April 9. Note: This coupon can only be used once per account, with a maximum discount of $60. (You must be signed in to use it.)