You can get the tickets on the spot or call in for the reservation. Also look out for ticket deals at Costco or Groupon
It is often busy and you typically want a reservation.
Make a reservation, you will be glad you did. That way, you will have your time. Prices vary, but the best deal is the return pack after you've flown. My advice is purchase a small package and then get the return pack. You can use it right then if you want.
Prices range from around $80 to $100 for a group deal. You can buy online or at the location.
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