There are many different classes of wheelchair. Most of the really cheap versions are medical chairs for people who can't move on their own for whatever reason, think the kind you see at hospitals or nursing homes for wheeling people around. This type is for people who can't walk but can still sit upright on their own and can move the wheelchair on their own. They're lighter, rigid and have higher efficiency than the medical type. They're also semi custom or adjustable to fit the user better than the temp/medical kind.

Would you buy an under-$200 bike off of Amazon? Especially one you spent all day on?

Smart phone under $200, would you want one?