I recently picked up a Used Specialized Hot Rock with 24" wheels 21 speed and front suspension. It's in excellent condition.
I have realized that it is the larger 13.5" model and is too large for my son who would fit the 11" model.
Perhaps you have the 11" model and your child is outgrowing it? Let's trade.
Otherwise I will just wait a little longer for my son to grow into it.

These are $470 new. see link for newer version, basically the same bike but they change the colors every year.
So if you really want to buy it and are willing to give me enough money for me to add a bit and get a new one in the right size, I would be willing to do that, too.

email with questions. If I actually find someone willing to do this, I can drive to meet.