There's a DIY television show I catch occasionally. In one episode, I saw a guy cut and bend a supermarket carriage into an electric wheelchair. I see those things in streams and gullies all the time - if cost is an issue and you're a DIY type, you might be able to turn the carrying basket of a carriage into a heavy-duty front basket without too much trouble.
Just found the TV show online:
http://blog.makezine.com/archive/200...culptures.html