Amazon with Direct Liquidations has the First Alert CO400 Carbon Monoxide Alarm for $17 with free shipping on $25+. Features an electrochemical carbon monoxide sensor, silence/test button, low battery warning and a end-of-life timer.
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Carbon monoxide detectors have a limited life. This one is a 5-year. Target sells a 7-year for $19.99. Once the time is up, the detector will beep and beep, and then you'll have to replace it. I would save the money (and time) and buy the Target one.