Sell your organs on the black market?
Become a street sweeper, and maybe you’ll be like my coworker who noticed several 100s in the road. Got out and found a bag with $50K. He did turn it all into the police though. But don’t think the rest of us didn’t go out there trying to find any stray bills floating around 
Either you have your kids become an exotic dancer. I’ve been told a couple of my kids’ high school mates did this with approval from their parents. If what I heard was true, they were able to pay for all of their expenses themselves. Their parents saw it as a return for all the money they spent on dance.