Help my 3 footed Kitten Please!

When my kitten was born her ambilical cord got wrapped around her foot above the heel and the portion below the heel fell off. She gets around fine except you can tell when she steps on the footless leg that it hurts her and the bottom of it where she walks is raw and breaks open... i was wondering if you have any cheap ideas to help her get around. Maybe a special boot or something to put over the end of her leg? Do you know where to get something like this? Please help i feel so bad for her. Thank you