Amazon has the First Alert 2-In-1 Z-Wave Smoke Detector & Carbon Monoxide Alarm (ZCOMBO) on sale for $34.18 with free shipping.
This is the lowest price in at least a year. Compatible with Ring alarm and Samsung SmartThings (and likely other Z-Wave hubs).
Link: https://www.amazon.com/First-Aler…B00KMHXF
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