Home Depot offers the Kidde Smoke and Carbon Monoxide Alarm with Voice Alert for $20.04. Opt for in-store pickup to avoid the $5.99 shipping fee. That's tied with our mention from two weeks ago and the lowest price we've seen. (It's the best deal now by $9.) It features a low battery warning, test reset button, and Smart Hush, which temporarily silences nuisance alarms. Deal ends October 25.