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We've used one from Kidde in the past and were happy with it. This one should be easy to install and had great reviews on Amazon: https://www.amazon.com/gp/aw/d/B00PC5S0PA
Be sure it is a carbon monoxide alarm you really need and not the propane detector alarm. Propane detectors are most often hard wired, are mounted close to the floor and near the stove/kitchen area in most cases.
Got that says right on the face Costar carbon monoxide alarm....was hoping to find a reasonably priced hard wired one....settled for a 10 year sealed battery one with a digital display....Thanks!