How did you find a good sitter?

I have a small circle of support—mostly family—and they are toxic. They will punish me and say horrible things then when I react, they refuse to help with my son. Dad won’t help unless it’s on his terms. I just need a sitter for 4 1/2 hours Friday and Saturday nights so I can work my job. I’m at my wit’s end. Care.com costs money and I care too much about my child’s safety to go on Craigslist (is that even a thing anymore?). I don’t use facebook. Any ideas?