I have a used Honeywell T6 Pro ZWave thermostat for sale.
Supports up to 2H/2C stages or 3H/2C with heat-pumps.
I've used it for about a year and a half. It is in excellent condition - I have very very rarely controlled it physically.
I'm selling it for complicated reasons. Basically, all Honeywell T6 thermostats determine when to use stage 1 or stage 2 based on "cycles per hour (CPH)". So it can start either in low or high stage and shift to the other stage based on demand and the pre-defined CPH configuration.
Because I need to occasionally run my 2-stage heat-pump on a mid-sized generator, I need better control of when the pump starts in stage 1 vs stage 2. So I switched to using a different z-wave thermostat that lets me control staging based on the temperature delta between set-point and ambient temperature.
Asking for $50 + USPS shipping (it'll fit easily in the smallest USPS Priority Mail box).