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$99 and if you cancel you get a "full" refund minus $50 for an administrative fee.
Mojang is already going to make a loss on this venue so why are they charging that much for tickets? It's not like PAX where there are tons of things to do and constant swag given away where they can justify an asking price of over $100 for 3 days. It's a cool concept from Mojang but honestly they shouldn't just piggybacked on an existing venue like PAX Prime (granted they can't launch minecraft "live" that early since it won't be done but not many people really care about seeing a game launch live)