I'm in NYC, recently turned 26 and signed up for the cheapest Oscar plan available. It's only around $180 a month — fairly high deductible (~$6,000) but includes free preventative care and a couple free primary care visits per year. I believe this "catastrophic plan" is only available for people under 30 yrs old, otherwise the cheapest is more like $300. Also doesn't cover prescriptions, but I don't have any so it seemed the best option for me right now.