I have a feeling that many of those pines actually came from Frank Kroeker. Go to the source. His prices are far too low.
Actually, at Brussel's you can see every stage of JBP from seedlings, graduating (without enough root work) from 1g to 5g to 10g and finally to a bonsai pot where they go up in price. I spoke with Brussel and Dana about their JBP material last fall; they import seed and grow their domestic stock right in that space you see in ml_work's photos. Starting with last year's "crop" he has gone to 'Mikawa' seed.
Combing through that stock, you can find relatively good deals; especially on the bigger-trunked JBP while they are still $350 in the fall before they go into a bonsai pot for $595 or $750...
It is interesting to see the progression of their container-grown material.
Not saying he doesn't get anything from Frank Kroeker, I think Dana buys regularly from other sources...a couple years ago some decent malus showed up, along with some JRP, domestic-grown, and not from the nursery.
OK...I admit it, when I was working regularly in Memphis, I'd get over there about every 3 weeks to unwind...amazing how a tough day can melt away when you start walking through the specimen house!