If it helps, check out THIS THREAD for some off-site rental companies that are loads cheaper than renting from Disney, and come highly recommended by the folks here.
Awesome, thanks! I thought about that yesterday and found one place off-site so far. I'll check out this thread and see what I can come up with. We had access to a cart one time at the beach any my now 5 year old LOVED it. Okay, so did I!!!