Was just talking with my buddy up there and he mentioned this
I read a story about a man who traveled around doing maintenance and repair on carts. He had a trailer with a work bench, parts and stuff. He would pull up in a parking lot and do it in the spot. From what I read he was making a small fortune doing this. The carts cost anywhere from $175-400. I couldn't help but think while reading it however that there can't be a huge demand because most stores I've seen run them until the wheels fall off then buy new ones.