Home Slickdeals First Alert Combination Smoke & Carbon Monoxide Detector (Battery-Operated) $22.40 Slickdeals First Alert Combination Smoke & Carbon Monoxide Detector (Battery-Operated) $22.40 By ARCOM - 8 October 2018 142 0 SHARE Facebook Twitter Go to the deal page: First Alert Combination Smoke & Carbon Monoxide Detector (Battery-Operated) $22.40