It really varies by state. I went to an online insurance comparison app (I should promote Leaky or SimplyInsured here, but at the time in 2010, I used ehealthinsurance), searched for HDHPs, then picked based on reputation. I picked a Blue Shield provider with no lifetime cap (or a $6mm lifetime cap, I forget).
The only states I know are WA and CA. In WA, I like Regence Blue Shield; plans seem to be in the $100-150/mo range now.
In CA, there are also a lot of HDHPs in the $100-150/mo range. I'd specifically avoid Kaiser as an employer giving coverage, as some people really dislike Kaiser since you must use a Kaiser doctor, hospital, or other facility, but if you're an individual and like a Kaiser doctor, it might be a good choice. Otherwise a lot of people I know use Health Net, Anthem, etc.
I'm not a lawyer nor am I a licensed insurance agent so I'm hesitant to recommend specific plans.
I think these rates are low due to being HDHPs and the "best" patient group; 26-35 year old single male. Those are exactly the people who don't get individual insurance unless they're cautious people who join AAA, change oil on time, buy fire extinguishers, look both ways before crossing the street, etc. (and thus exceptionally good risks), and even then seek to minimize contact with doctors. I suspect the unhealthy ones are particularly likely to take jobs with insurance, or be on medicaid/prison/etc., in that bracket, or are so irresponsible as to have no insurance (because hey, even $120/mo is better spent on beer).
Rates don't seem that much worse for women (which is weird, since I'd assume most women get enough extra covered services covered now by an HSA to destroy the actuarial model for a $100/mo plan). The rates 4x once you add children, though. I tried also plugging in numbers for people born in 1969, 1959, 1950, and rates do go up, but only maybe 4x, too. So the prices are generally within a 10x range per insured, at least for healthy people or in places where there is no medical underwriting, tops, and under ACA, that will converge to 4x (although I'm sure by raising the low end by 50-150% and only lowering the top end by a trivial amount.) I always assumed all insurance was $500+/mo/insured, since that's what the group rates for small businesses seem to be, but that's due to adverse selection and inefficiency I think.
The real problem seems to be if you're unhealthy when looking for insurance, or have children (particularly with high medical costs), or have an acute high-cost event, or are poor enough that $100-200/mo is a hardship (even though I think $100-200/mo for health insurance, whether paid by the individual or the government, is pretty reasonable), or are, worst case, so unhealthy that you're also poor and thus doubly screwed.