Go on line only
Never buy a ticket at the gate or at a third party vendor. The gate is the higher prices and a vendor, you have no recourse if there's a problem with the ticket or your reservation. I know of two people that lost over $500 because of buying from a vendor. Always go online. As was mentioned, they usually have some kind of promotion or discounts.
$130 per person, per park
It depends on a lot of variables. You can price it out on their website.
Go to Walt Disney World .com For prices. There's a Florida resident discount as well
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