My Dad with Medicare would like a Mobility scooter to assist his walking. Where is the best place to shop and is there a subsidy?

I got one second hand, like new for $200. It just needed a battery.

My parents worked with Hoveround, who did all the insurance work. The doctor will have to prescribe it before Medicare will cover it. I don't know if they will cover a scooter or just a chair. Medicare used to not cover scooters, but I think that changed. Not sure.