Johnson rifles, LMGs, and DROR's are all in this country in modest quantities. You won't see much mention of them on this site as they are mostly in the hands of older folks who aren't all up on this newfangled "internet" thing.
When I was a kid attending shows and auction 30 years ago, I want to say the Johnson's I saw come and go were about 800 bucks. They all seem to be about 5 times that price now.
Of course, Garands have gone from being $200 guns to $2000 guns in the same time frame, so I guess the Johnsons represent a deal.