shoulder holster? I seem to remember there was one for Aiko  3 a while back. Belt holsters you could get from Questor (Daz 3d's free archive), but that's not what you asked for.
Maybe try Whatever3d, search on holster...

I wish I'd said that.. The Staircase Wit

anahl nathrak uth vas betude doth yel dyenvey..;)