where are all the lates 20s-30s people hanging out to meet friends?

I am looking to reinvent my social life and literally checking everything from cooking classes, fitness, dancing, etc. I had some good luck but I feel most are expensive to keep up with and most people aren't willing to pay for some activities JUST for the off chance of potentially meeting someone (friends in my case but can be spouse), if it isn't guarantee. I am very open minded and willing to try ANYTHING. if I don't like something after a few weeks, I'll happily move on to the next.

Any ideas? NYC should have everything for everyone but it seems threads keep popping up with people still struggling.