First Alert ZCOMBO 2-in-1 Smoke Detector & Carbon Monoxide Alarm, Z-Wave Combo Amazon $30

First Alert ZCOMBO 2-in-1 Smoke Detector & Carbon Monoxide Alarm, Z-Wave Combo
Tied for second lowest price ever according to CCC. Lowest price since December 2017 ($26.54). I know Costco has a 3 pack for $100 and been on sale for $80 but I don’t have a Costco near me.
https://www.amazon.com/dp/B00KMHX…iEbJWCB77V