I don't know where you live, but we live in Florida and the local auction often like almost all the time has scooters (many really good quality) hardly used that they sell off at reasonable prices....but we got a lot of old people out here with always an excess of medical equipment. I've been thinking about getting one to have when (not if) we need it.
My suggestion is the next time you go to the grocery store, use their scooter to get a feel for what one feels like. My husband I and did this so it wouldn't be so scary thinking about how to drive them or what they were like. The unknowing is the scary thing. The grocery store ones aren't so scary once you get on them and see that they don't wobble and aren't hard to drive. They don't tip over and they don't go fast---you can go forward and backwards. I had to ask the young bagger how to get mine started.