First Alert CO600 Carbon Monoxide Alarm - Walmart.com
PROSiXCOMBO - Resideo Honeywell Home Wireless Combo Smoke/Carbon Monoxide Detector (for ProSeries Control Panels)
X-Sense 10-Year Battery Smoke and Carbon Monoxide Detector with LCD Display, Dual Sensor Smoke and CO Alarm Complies with UL 217 & UL 2034 Standards, Auto-Check, SC08, 5-Pack - Amazon.com
Ring Alarm Smoke & Carbon Monoxide Alerts | First Alert Z-Wave Smoke/CO Alarm | Ring
New S Tech Carbon Monoxide Alarm Clock Am/Fm Radio Voice Warning | eBay