kaiser is the cheapest in CA. Find a broker and work with them. Usually requires a percentage of employees to sign up and a particular number of them.
You know I hate Kaiser, but they are better than nothing. I do have to admit my last trip to the hospital earlier this year at Kaiser was actually kinda positive. Got a bad sliver in my hand, and they had me out the door in less than an hour and a half with no appointment. Required slicing me open to remove it. Unfortunately it was the day before we went to Kona to go diving, so I had to stay out of the water for a couple of days. Of course two weeks later it was still tender, and a flashlight revealed there was a second piece of wood. I performed the surgery myself this time, and finished the job.