If you aren't starting a company because you can't get private health insurance, you are probably not resourceful enough to be a successful entrepreneur. It is just not that hard.
It's a crapshoot. Dirt cheap for some, out of reach for others. Some people have been blackballed by the entire industry for the sin of developing a serious condition—the underwriter finds an excuse to weasel out of the coverage you thought you had, and then you can't get it ever again at any price. Group plans are a lot more likely to be available and to uphold their end of the deal.