I took my mother to WDW a few years ago and rented her a
scooter.
I got it throught Walker Medical Supply, and they were wonderful. When we checked in, it was waiting for us in a back room, and we just left it at the front desk at the end of our trip to be picked up by them. It couldn't have been a more trouble-free transaction.
The phone # is (407) 331-9500.
The charge for 5 days/4 nights was $117.00
If you have other questiosn about your trip with the scooter, you might want to try the disABILITIES board at this site. They are very helpful.
By the way, the scooter is a lot of fun! And it didn't hinder our trip in the least.
Also, you might want to call the resort a few days ahead of time and nicely request any room they have in your catagory that may be a little larger to accomodate the scooter. I did this, and was pleasantly suprised to see they had upgraded us to a lakeview "fancy" room (I don't know what they called it officially). It wasn't a suite, but it had an extra little seating with a couch and a couple of chairs. Nice and roomy indeed!
In our case it was probably good that we didn't request a handicapped room, because that would have limited their opportunities to ungrade us.
Nicole