This Nest E Programmable Thermostat drops from $169 to $149 after you add it to your cart at P.C. Richard & Son. Walmart had it for $1 less, but more readers may save on sales tax by buying at P.C. Richard. This is one of the newest versions of the popular Nest smart thermostat. It features smart, energy-saving programming, WiFi connectivity, and the ability to be voice-controlled with an Amazon Alexa or Google Home device. There is no sales tax (except NY, NJ, CT, PA, MD, MA, and DC).