you looking for something named or just some wild seedlings? In our area wild trees have 60 chromosomes and produce small fruits about the size of a quarter. Up north they have the 90 chromosome trees hat produce fruits up to 2 inches across with the named varieties producing the largest because of the improved genetics. If you just want seedlings I have some 90 chromosome plants I can send you for postage.
If you are looking for named plants I'd recommend Cliff England's plants because his plants and selection are Superior to other vendors.
http://www.nuttrees.net/