Patrick is correct, I was just there two days ago and needed one also
It will cost you $ 55 for one whole day
As soon as you get to the parking garage there are wheel chairs you can use to get to the hub where you will be able to rent a electric wheelchair for the day. I think you can reserve one in advance by calling guest services for the park you will be visiting
I would try to contact them directly to get an answer to that question.
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