Re: Dwarf Heritage Fruit trees or grafting rootstocks..
Eversen Nurseries can supply apple rootstocks if you need a few (I think they have a minimum order of 50 per variety). I ordered one hundred MM106 and received them quickly, although they only had small whips. At about $180 delivered, or about $1.80 each I was very happy!
I've grafted up 60 heritage graftlings and will do more when I can find more budwood.