Google Nest Thermostat E, Free or Up to $25 Select Customers
Some electricity providers in CT, MA and MI are offering free of very cheap thermostats. You can get a Google Nest Thermostat E either for free, or up to $25 of you are an eligible customer. The also have similarly priced ecobee3 Lite or Sensi Touch Smart thermostats.
Check if you are eligible through your utility provider, and also let me know if it works for you. I’m not familiar with these companies.