Long time same-day ticket Met ticket person here. The regular same-day $25 program unfortunately is "up to" 100 (or maybe more) tickets -- they tend to go really quickly - as in a few minutes. If you get a sold out screen - keep refreshing and you might get a chance to buy, but in my experience it's almost impossible for hot performances. The good news is that they will likely record it for PBS and/or Met on Demand. They did it with a number of performances in 2019.
