The ZEPHYRx Home Spirometer has a 1 year warranty.
https://www.zephyrx.com/warranty
Replacement cost for device outside of the warranty: $139 (must be ordered through ZEPHYRx)
Replacement cost for reusable mouthpiece and turbine combined: $39 (amazon)
Cost for 60 disposable mouthpieces and turbines: 111.70$ (amazon)
Cost of pediatric mouthpiece: 3$ + shipping (must be ordered through ZEPHYRx)