Walmart has the First Alert Smoke Alarm/Carbon Monoxide Alarm Combo (SCO403-3) for $16 + $1 shipping = $17 shipped. Includes battery-operated CO detector with electrochemical sensor, 85-decibel smoke detector and 5-year limited warranty.
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most people dont know , but carbon monoxide detectors have expiration dates. most likely smoke alarms do too.
CO alarms expire ~ 5-7 yrs.
Smoke alarms ~10 years. See manufacturer's instructions...