There are a few online pages that sell tickets but in the official site of the artist or the stadium yo can find them
Last time that I saw a show here I used AXs.com. Their prices are pretty fair and they have a mobile app that you can use to have the stadium staff scan the code on the smartphone, no need to print it out like some tickets I've bought online.
Of course very recommended
They know if the day of the event want to sell tickets at box office go to Disney on ice
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