Amazon offers the First Alert 2-in-1 Z-Wave Smoke Detector & Carbon Monoxide Alarm for $37.27 with free shipping.
Z-wave compatible smoke and carbon monoxide alarm. First Alert Z-Wave Detector - NOT WINK compatible
Wireless connection to z-wave hub (not included)
Reliable electrochemical co and photoelectric smoke sensors
Features single button test/Silence and side-access battery drawer
Meets UL standards and backed by 7 year limited warranty
Certified for use with Nexia Home Intelligence or other Z-Wave systems
Combination Smoke and Carbon Monoxide protection that alerts you whether you are home or away
Photoelectric smoke sensor helps reduce false alarms such as from cooking or shower steam