Hello, why are you selling this thermostat?
Hey there! I see your interested in the thermostat. It is awesome. I was hoping to get maybe 45? I am moving to a new home and it already has this unit installed. 
Ok, how old is the unit?
Only a couple of months. 
Ok, I can offer $30 if that is acceptable?
Want to meet in the middle at $37?
Ok, I can live with that.
Sweet!