Best Buy offers the Samsung SmartThings ADT Carbon Monoxide Alarm for $19.99. Choose in-store pickup to avoid the $5.49 shipping fee. That's tied with our mention from two weeks ago as the lowest price we've seen. (It's the best deal now by $8.) It can send alerts to your smartphone via the SmartThings Mobile app.
Start off the new year by implementing these small-but-smart savings strategies. They'll soon add up.