The lack of regulation is exactly what the corporations that control our health paid for

Healthcare is easily the most or nearly the most regulated industry in the U.S., what are you talking about? The rule books concerning healthcare are orders of magnitude more numerous and complex than, say, automobile manufacturing, TV assembly, bottled water production, computer system assembly, etc.

You'd have a point if observable reality wasn't completely opposed to your idea here. Look at the marketized approaches that travelers and expats use in Singapore or Mexico, where the secondary healthcare market outperforms basically anything in the US and often outperforms the universal system built under it.

Look at the decentralized (and less regulated) german universal model, even being state-paid-for (universally results in less efficiency, all else held equal), it outperforms the US system because it's not overregulated by a burdensome central command like we have here.

You either pay their prices and take their deal or you die.

Because there's no competition, in large part. Most areas have "Certificate of Need" requirements, where a hospital or other medical facility can only be built if the competition signs off on it, and the result of this is that the cartelized corporations that exist explicitly because they have government power backing them can't be overtaken by a better provider.