Prior to the gates opening, a number of "uniformed" individuals roam the grounds offering tickets. It was announced where the kiosk was located for purchases during the event.
Look for the 50/50 sellers in the neon green t-shirts roaming the plaza before the games or on all concourses during the first two periods.
At marked booths and by roving sellers inside and outside the arena.
You can get them at the box office or their are people walking around selling. Best bet is box office
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