Welcome to the forum junglerv. Nate from wildlandplants.com should have some male scions soon. Perhaps he will have some female scions as well so you should inquire.
Check out his website at
https://www.wildlandsplants.com/This forum occasionally has group buys to bring over trees from China. These trees are bare root, required by law, and are difficult to establish but is a much safer route than the illegally imported trees that come with soil and roots. There is a good chance that the plants with soil and roots are harboring nasty insects/ pests/ organisms that could potentially be devastating to your garden so please don’t consider these trees. If these trees are brought over, you could get a visit from the authorities.
Best thing to do is to purchase trees that are grafted onto rootstocks grown in the USA. These trees will be more expensive but the survival rate will be an order of magnitude higher than the legally imported bare root trees. I know people that purchased 20-30 of the bare root trees and every one of them died.
I know there are people that started grafting Yangmei onto USA grown rootstocks so hopefully the trees will show up for sale in the near future. For now, it would be a good idea to plant some rootstocks such as M Rubra, Cerifera, Californica and Pennsylvanica.
Simon