Last year, I purchased 2 Siberian Stone Pines and 17 Korean Stone Pines from a Canadian outfit, Rhora's Nut Farm. The
trees were not cheap, at least in price. Despite good conditions this summer and careful watering, half of the trees failed during the summer. So I'm really bummed that 1) Rhora's has hiked up their prices considerably because they have an apparent monopoly, and 2) I have no other apparent options.
If anybody out there knows of another nursery that will ship to Wisconsin, USA, I'd love to hear about it.
Also, if you're reading this, realize that we need a US source of stone pines for
permaculture. There is an evident demand. I'm considering buying a bunch of seed and starting as many trees as I can so you can get these essential trees.