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.
Uncle Sam is not the only one looking for a piece of your retirement income. Is your state on this list?