I’ve purchased quite a few trees in the last 12 months and what I’ve come to learn is that collectors with the best materials tend to not post them online. Or rather they do not have to. They also prefer to sell to people they know. So reach out to the main collectors; Randy, Dan, Steve, Todd, etc. and visit their nurseries/place of business to be on the shortlist of who they’d reach out when they get new materials.
As for shipping, very few sellers will figure shipping out for you but there are definitely services that’ll white glove deliver trees to you. Best part is the courier will remove the liability from the seller and you as they carry insurance.