A cheap robot vacuum.
My wife was against it, so I bought it in secret, let it run around the house during the day, and she was amazed at all the cleaning I was doing. A few months later, I let her into my dark secret, and now she loves it too.
Speaking of wife, I bought her a hooded blanket with an electric warming bag a few years ago. Within 3-5 minutes it's nice and toasty, and she's used it practically every day since I bought it.