Google Nest Protect Smoke Alarm and Carbon Monoxide Detector, 2-pack | Costco
Nest Protect 2nd Gen Hardwired Smoke and Carbon Monoxide Alarm, Wired 2PK - Newegg.com
Google Nest Protect Smart Smoke and Carbon Monoxide Detector Alarm (Battery) in the Combination Smoke & Carbon Monoxide Detectors department at Lowes.com