There is a minor urgent care place near me that basically bills my insurer what it can and eats anything that is denied by my carrier, i.e., doesn't balance bill me. Longest I've ever waited to see a doctor was maybe 20 minutes, I've never paid a dime out of pocket, and the place is nice AF. I had cellulitis on my neck that required IV antibiotics and an incision to drain it (PM me for pics). I had to stay for a night and it was free and amazing.
Though I don't think this experience illustrates the beauty of the market as much as it does the insanely inflated cost of healthcare. I have a friend who is deeply invested in these urgent care type joints, and he said some shit like one of his clinics can see like 8 patients in a day and just with that money cover that day's entire overhread: pro rata rent, payroll, fucking everything. They have mushroomed up EVERYWHERE in Houston, which has a medical center people literally travel from all over the WORLD to get treatment.
Will be checking this thread often because (meaningful) affordable healthcare for every American is a fucking real possibility, which kind of blows my mind still and is about the only silver lining in this dark Trumpstorm.