Amazon.com has Kidde KN-COPP-B-LPM Battery-Operated Carbon Monoxide Alarm with Digital Display for $13.56 (discount seen at final checkout). Free shipping with Prime or if you spend $25 or more.
* Large digital backlit display is easy to read, even in low-light conditions
* Peak-level memory displays the highest CO concentration measured since the last reset
* Meets the requirements of Underwriters Laboratories (UL)
* Battery operated with three AA batteries included
* Backed by a five-year warrant
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