It is my belief that the only truly free markets are basically black markets.
The problem with this idea, is that black markets only exist when there is state oppression. It's actually a protected (isolated) market, just as much as it is often a horrible place to do business.
Choosing a black, over white or gray market is not a solution to the problem with state agression.
If you want to live politically free - thus allowing you to act more freely - you have to seek or establish government protection in one form of another (selfgovernment for example), from state government agression.
So are there any free markets? Yes, there are some free markets at this point in time. In fact, this blockchain could be considered one of them.
And then there are some freer geographic areas. Liberland, for example though maybe not successful anymore, has found a legal loophole that gave the founder some insulation from other governments and an oppurtunity to establish an organisation for more political freedom. This is more of a gray area solution, but still not clearly black market.
Thanks you make some very compelling points!