If you are willing to trade, you might want to try the seed exchange forum here at Gardenweb. Some of the trees I've grown from seed trades are Pawpaw, Carolina Silverbells, Poncirus trifoliata (these all grew to blooming size now), Golden Chain Rain, Franklinia, Amelanchier, Ginko and Katsura, among others. I have tried several evergreen trees without success. It's an economical way to add variety to your collection.
