If you live in New York then it's donation based. But if you're not from here I believe it's $25 for adults. They have machines that are behind the information table that you can buy tickets from rather than stand in the longer traditional ticket lines. Also if youre facing the museum from the outside there's an entrance on the left of the main stairs that goes to the basement level it's less crowded there on weekends and they have a ticket line or you can buy from a machine there. Hope this helps
Actually the Metropolitan museum does not have set price tickets, it's just a donation based admission. No need to buy online.
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