I'm in the same boat, hard to find good AP maples let alone deshojo in the NY/NJ area at any of the nurseries other than the occasional emperor, bloodgood or generic APs. I got a chishio improved from Mr.Maple and it seems ok.
I've only found 1 shop that i like in NJ, Allshapes Bonsai, but i didn't see any deshojo's.
I just hope that Evergreen gardenworks will have enough next season for me to get one or two shin deshojo's because they seem to be the best in terms price for quality.