Since the RPG won't allow me to have 0 of any stock of item (including the ultimate job class attacks), I have decided to simply put a restriction on the moves.
I have set the level to buy them at 100, which you probably won't have enough MP to actually use it until that level anyway. There will be an unlimited number of them, but you must be of very high level (level 100 or above) in order to buy and use it.
Good luck!!
