Kidde Hardwired Combination Carbon Monoxide & Smoke Alarm, Model KN-COSM-IBA – $19.40

Good deal on a combination smoke and CO hardwired detector.
Walmart also has the 10 pack for approx 155 in case someone wants to replace all detectors in the house. The 10 pack is a great deal.
https://www.walmart.com/ip/Kidde-…8091f48cc6