I don't really know how i can have missed this! Your suggestion is good. I'm already a members of fruitiers since the last few years, i'll start researching immediatly. On the other hand a nursery is more reliable because, you know, with fruitiers you must find someone willing to send you scions, and this isn't always the case. I understand that people with the bigger collections probably get a lot of requests and they can't spend all the time sending around scions. But sometimes even if you find a clone, obtaining scions can be hard.
By the way, I was wondering, is someone capable of describing me the flavour profile of Carya ovata?