I spent 6 months on a private health insurance plan 4 years ago. It was about $200 per month with a very high deductible.
This is in a state that is favorable for ACA. I just hopped on the state website now and I can get a similar plan with a premium of $250 per month. There are a lot of options with better deductibles and higher premiums.
It's a burden for those who want to go without external employment, but I found it reasonable. It's less than my monthly budget for food.