Cannot share all my secrets .. but I have to say pure raw Yamadori in my experience is Andy Smith , I also obtained a tree from Todd Schlafer. I style my own and repot my own so pure raw material is my game.
The other websites offered are goood too but you need to know what can successfully live in your climate , and know what you can handle too. I apprentice at a studio so I’m an outlier with materials that come through our gates or with other regional professionals/ collectors at my disposal that I can contact with a online message, phone call, or text…... Bjorn , Mirai , Back Country , Peter Tea, Left Coast, Wigerts etc provide good material but again you have to be ready to handle the material and if you can afford, and get it before someone else scoops it. Check your area or local club too for non online because I’ll tell you what , it’s always best to see what you’re getting in person..
Now, all those sources have trees for sale on the spectrum of cost but again I cannot stress enough that you need to know how to care for it ,how to successfully adjust it to reclimateize , that it CAN fit your climate or infrastructure ( garage , greenhouse, outdoors only) and that you can budget. If a gorgeous tree is purchased and then I see a post with “help my tree is dying” I will roast you like a bag of almonds … kidding as I’ve done the same here hah but again just do your homework first.