We have not been able to find anything better than what you are getting quoted. One possibility would be to manage your income so you do qualify for subsidies. It sounds kind of like cheating, but the government set up the system and if you use all the tools available you might be able to use the system to your advantage.
Things like contributing the max to all the potential retirement accounts to lower your taxable income. If self employed, stack your expenses so you have a low income year and get substantial subsidies one year to offset the unsubsidized income the following year.
If you are retired, invest in instruments that do not generate dividend or interest income and sell a combination of winners and losers to obtain a taxable gain income that qualifies for subsidies.
I don't like medishare for two reasons. First, it is not insurance, it is a cost sharing program. To me, that is one step short of a Ponzi scheme. I won't take chances with the potential of having catastrophic health expenses and being out in the cold if they run out of other peoples money.
Second, they have a bunch of gotchas in the fine print. Things like you must practice good Christian Behavior. I won't take a chance that somewhere there is a photo lurking of me drinking a beer at a football game that will disqualify me for coverage of a heart transplant.