Carlos,
I'm so happy to see you're selling avocado scions!
The only thing that makes me sad, is I don't have any rootsocks now!!
I wonder if you could sell some small one gall rootstocks? You could bare root them and prune them back, and probably fit 5-10 in a small box....they could be potted up and grafted upon arrival at their destination.
Just an idea...from a desperate grafter...LOL
I hope you I can get some scions from you later this year...I should have some rootstocks big enough by then.
Good luck with your scion sales. You are helping to disperse and protect all of these varieties of avocado!