Metal box for electric wheel chair

I live in a small house, no where to keep a electric wheelchair, couldnt get it over the threshold anyway, so ive put off getting 1, staying indoors or relying on a friend to push me in my wheelchair which is foldable and stays in the house. I have recently seen a metal green box out side some1s house that i saw her putting her mobility scooter in. Ive never seen these before, does any1 know where you can get them from? Tia,