I just came across this site that sells some scionwood:
They're called Cricket Hill Gardens. They have a small selection of apple, apricot, pear, mulberry, asian pear, quince, and elderberry scions for sale focusing on cold hardy varieties. It's too late for me this year but I'll check them out again next year.
Update--> I think they are in Connecticut, they also sell some bare root trees and peonies. I've never heard of them before but the site has some good info.