You buy them at both. Also other places have them too, Costco has a deal.
Online, at Randals, Walgreens, or at the gate there.
Do you go to Walgreens like what do you say?
As everyone else said, they are available many places. But the best deal is online in the spring. They have a day where the tickets are half price on the website. FYI
Buying at the gate is definitely more expensive, though.
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