Are there any associations one can join that would then give you access to group health insurance?

From my research so far, it appears that if you have a group health care coverage, it tends to be cheaper than if you have to buy the insurance yourself. For example, a family of 4 may pay as much as $700 a month or more for some decent coverage, but perhaps group coverage from your employer may cost you $400 or so. But if your employer does not offer it, are there any associations that offer health insurance to their members? Associations that anyone can join?
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i live in indiana; the AARP plan is only a supplemental plan or they offer a hospital plan that from i read is basically a supplemental plan also; my husband has parkinsons disease and uninsurable in the state of indiana; i am healthy and filled out a individual application and was surprised that they needed a 10 year history of every illness or exam i ever had; i was suprised since auto and home is only 3 years, but calculated that if someone had cancer and was over the 5 year survival rate, they would be uninsurable since they had had cancer; i found out the hard way that if you have a pre-exisiting condition, they cannot insure you on an individual policy in the state of indiana; you are then able to go to the assigned risk pool which has a get this ;;;;$100K lifetime maximum; also, 5 years ago, when i was laid off from my 1st job and when the cobra ran out, they offered us a conversion policy with the same company for $2K per month for my husband only; it had a $100K max on the conversion policy; (cobra had 1 MM) we figured in 4 years, the insurance company would be in the black for paying $96K in premium; my husband is a self employed attorney and i am a laid off claim adjuster; so far we have managed on cobra and now am going to try a gap policy; this is a 2K deductible; but all we want is take care of any catastrophes; it does not cover RX and my husbands RX run over $200 a month; parkinsons is mainly drugs only; since i am 8 years younger, i hope i dont get sick; our concern is that if something major happens, we could lose everything we worked for over 30 plus years; that is why i am wanting some kind of universal health care; since over 47 million are uninsured and many are employed and cannot afford putting us in this mess; insurance is supposed to be the law of large numbers; if we insured everyone, you would have both the healthy and sick paying, which would keep the premiums down to pay claims;
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