Walmart has the Kidde AA Battery Operated Basic Carbon Monoxide Detector for $10 (regularly $20.99) for a limited time. Shipping is Free for Walmart+ Members or pad your order to $35 or more and score Free Shipping.

CO detector that alerts with a warning signal against dangerous levels of carbon monoxide in your home. Easy & quick installation – powered by AA batteries, no hardwiring required. The 85 decibel alarm alerts of high carbon monoxide levels. This allows you and your family to evacuate the residence safely.