Mobility/invalidity/disables scooters?

for free or very very cheap

average 拢200 second hand or you could just wait outside the post office and carjack one

You can hire them from some Mobility shops.

yes u can buy them cheap or when u go shopping u can hire them for free(but yor need a deposit to put down) your find these at the main disabilty car parks in town centers but advise in pre booking as they do have a limited No....
check your local council for information on this...good luck.
p.s if all else fails..don't carjack 1....lol...