https://www.gocontrol.com/detail.php?productId=3
Works fine, it was used with Hubitat for about a year until we changed our
furnace, requiring a different thermostat.
Retail: $100
https://www.amazon.com/GoControl-Thermostat-Z-Wave-Battery-Powered-Works/dp/B00ZIRV40K
Asking: $50 with pickup in Philadelphia, PA USA. Contact me for shipping elsewhere.
What did you end up switching to model wise...
Salus.
I quite liked the GoControl, but I needed something that would speak with a multi-zone heating system, and I didn't want to go completely DIY.
The Salus system is "OK" -- Zigbee for local communication, wireless thermostats, good physical interface, reliable. However, it requires cloud for complex scheduling (on/off/setpoint override can be done locally at each thermostat w/o internet access or need for HE) and the zigbee is not integrated into Hubitat.
If the Salus units failed during the summer & I had the free time, I'd consider going DIY instead.
Hmmm.. Have you tried the generic zigbee thermostat driver for giggles with it?
I did when I first got the system. As I recall, the thermostats & relay panel & gateway, despite being zigbee devices, didn't even appear in HE when doing a scan to add new devices.
The gateway is accessible on my LAN (w/o cloud access).
If I can't find the time to learn enough groovy to port the existing python driver (unlikely, while I'm still working at a paying job), I'll probably put the python driver on a Pi, with a simple web front end (REST?) and have HE talk to that.
Of course, I don't plan to hack my heating system in the middle of January in the northern hemisphere, so any of this can wait until summer.
Chicken.... 
Download the Hubitat app
