Hi Davdson! Welcome to planDisney!
You are SO close to your visit to the Walt Disney World Resort! I know how excited you must be! Before you know it, you'll be exploring the theme parks and making a lot of special
memories.
When it comes to
renting strollers and
Electric Conveyance Vehicles (ECVs or scooters) directly from the Walt Disney World theme parks, both are available on a first-come, first-served basis. They are not available to rent in advance. I've never had any trouble renting either, though! Both can be rented daily, but strollers also have the option to purchase a "length of stay" rental. This saves you a little money and time per day since you simply show your receipt on the following days to pick up your stroller.
There are outside vendors like the Disney Featured Provider, ScooterBug, that do allow you to rent a stroller or ECV in advance. This is helpful for those that will need their rental outside of the theme parks as well. You can give them a call for pricing and information at the number found in the rental links I included above.
I hope this helps, Davdson! Please let us know if you have any other questions.
Tabitha