We just rented one on Wednesday from DTD. They are the same $10.00 (single stroller) as in the parks. You can use the reciept for the same day at any of the parks. Only difference is that they take an imprint of a major credit card. If you do not return it by a certain time they will charge your CC $250.00. They ask that you keep it with you at ALL times. I ended up pushing a empty stroller for most of the time at DTD. We rented it for my 5yr old and he was always out to look at things. I understand the $250.00 rule completly because we were almost out to the parking lot and remembered we had their stroller. (we also had our own stroller for my 2yr old)
The strollers are the jogging type look alike ones like they have at MGM.