Mine is cheap, low-deductible, and covers catastrophic events. For working numbers, its $415 per month, $2500 deductible and per person/year maximum out of pocket, $5000 for the family. I pay a bit more to get a larger provider network. I had a plan a couple years ago that was < $200/month, $1500/$3000 maximum OOP, but we had to drive across town for an in-network provider.
These kinds of plans were common (and cheaper) prior to the ACA. The biggest change is that the post-ACA plans have smaller provider networks, where before, they were similar to employer-provided benefits.
The biggest "downside" is it is absolutely, no exceptions, cash payments until you hit the yearly deductible. Even then, the negotiated rates for procedures are sometimes cheaper with insurance, sometimes not. So, I had to get a head MRI late last year. Doc wrote a script for a local hospital that would take my insurance, which was a $3K procedure. I called up a local imaging company, it was $615 cash. A little bit of price shopping saved me $1800 ($2500 OOP - $615 or so).
US citizens forgot that a lot of private insurance was really quite good compared to post-ACA plans, and as long as you get "illegal" insurance, it still can be.