I have ressies with Apple for 2 upcoming trips. I'm going to be doing some research this week and see what else might be available. If Alex is gone that would be very sad, he was great.

FYI from the official Disney website:

Disney Featured Providers
In addition to the locations listed here, several Orlando-area companies also offer ECVs, wheelchairs, strollers and other mobility products for rent. Pre-orders and deliveries to Disney Resort hotels are available through these providers, which include:
Best Price Scooters and Strollers: (866) 866-3434
Apple Scooter: (800) 701-1971
ScooterBug: (800) 726-8284
CARE Scooter Rentals: (800) 741-2282
Buena Vista Scooter Rentals: (866) 484-4797