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Fruitlovers says that he has it in this post from 2015.https://tropicalfruitforum.com/index.php?topic=13770.msg174555#msg174555
When I talked with silber, he was annoyed that others were selling his kei apple. However, he didn’t want to sell me one. I don’t think the other nurseries are cutting into his profits! He also refuses to ship. Marta Matvienko here in the Bay Area planted out several of these, and got one sweet female. She offers it on her website, among many other great scions: https://reallygoodplants.com/