Love the thought Fiona!

We looked into getting one some years ago now (about 12, so a while!) for my dad to use inside the house.
At the time, from memory, one to go up a full flight of stairs was about $7000+...mum and dad decided we should just move house as mum didn't want to be tied to the house forever lol

Anyway, like I said that was a long while ago now so prolly not very helpful. But I don't imagine they would be cheap - and if you want to move anyway...

Also not sure how well they go outside in the weather?

GL