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Best Combination Smoke Carbon Monoxide Detectors Deals Online in the US (10 deals found)

Last Updated - March 15, 2026 Sort By:

Best Choice

New
First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMCO100, 1-Pack,White
First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency

$38.05 $44.99
Used
First Alert Combination Smoke & Carbon Monoxide Alarm, Battery Operated Detector with Test & Silence Button, SMCO100, 1-Pack,White
First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency

$34.62
New
2 Pack Smoke and Carbon Monoxide Detector,Smoke Detector Carbon Monoxide Detector Combo with Batteries,Fire Alarm Smoke Detector with Test Button and Digital Display
Two Sensors: Carbon monoxide detector smoke alarm has a 2-in-1 dual sensors, photoelectrical and electrochemical sensors. They work separately, no matter which one reaches their dangerous concentraion, combination smoke carbon monoxide alarm detector will go off with red led flashing

$48.99
Best Value

New
First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack
First Alerts Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency

$52.79 $64.99
Used
First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack
First Alerts Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency

$48.64
New
First Alert SMCO100 Battery-Operated Combination Smoke & Carbon Monoxide Alarm - 3 Pack
First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency

$115.50
Used
First Alert SMCO100 Battery-Operated Combination Smoke & Carbon Monoxide Alarm - 3 Pack
First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency

$86.37
New
First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup - 3 Pack
First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency

$152.42
Used
First Alert SMICO100-AC Interconnect Hardwire Combination Smoke & Carbon Monoxide Alarm with Battery Backup - 3 Pack
First Alert's Precision Detection advanced sensing technology complies with new industry standards to reduce cooking nuisance alarms and provides early warning in the event of a home fire emergency

$129.57
New
6 Packs, 2 in 1,Smoke Carbon Monoxide Detector,Carbon Monoxide Detectors/Smoke Alarm,85 dB Alarm,Large Screen Readout,Test Button,Battery Operated, Work State LED Flash,Easy Install
Comprehensive Protection: This smoke & carbon monoxide alarms combine the power of two important safety features in one device to protect your family from both smoke and carbon monoxide dangers

$99.15

10 Combination Smoke Carbon Monoxide Detectors deals are available from: Amazon stores, starting from $34.62.
The biggest discount we found is 19% on First Alert Combination Smoke & Carbon Monoxide Alarm, Interconnect Hardwire Detector with Battery Backup, SMICO100-AC, 1-Pack at Amazon.
The lowest price we found is $34.62 while the highest is $152.42.
Prices for the best Combination Smoke Carbon Monoxide Detectors deals average at $80.61.
Last updated on March 15, 2026.
We scanned these quality online stores and more to deliver you with the best offers online available for Combination Smoke Carbon Monoxide Detectors.