I found a hidden Amazon promo code on a 4-in-1 carbon monoxide detector. It's on sale for $31.29, but entering the promo code 8AFJ3WLV drops the price to $18.77. That saves you 58% on the retail price.

Online Deal at Amazon

Carbon Monoxide Detector

$18.77$44.9758% off

What to buy

1 4-in-1 Carbon Monoxide Detector, $31.29 $44.97

Exp 08/16/25

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