Outside vendors are cheaper than at WDW.
No sure about the animal kingdom. You would have to go on line or call
No you can't reserve it early. It's $50, but you get 20 back when you return it.
U can rent one but I dont remember the price
It is possible to get it at a better price in the surroundings. You can do it upon your arrival.
I would say yes, but it'll be probably in the $20s
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