Limited shop numbers

[DeadHands]

Well I will put it like this. My RPG is pretty much finished, I had a few broken(hidden) things in it which you could get infinite attack def mystic MP, HP, Agility ups as you could buy, also included a way to get infinite money.

Is there any way for me to put a simple script that would limit the number you could buy or would I have to create a complex varible for each item to check for the max # bought, vs the # held type thing.

[DeadHands]

Well i made one just like I said. I used show choices and then had the condition read >=20 then item +1 -200 gp +1Hp/Mp/atk/def/ up
custom handler of messagebox "there is no more"

it's tedious to buy but it works at limiting these powerful items.
I just wish to have it as the shop window only with limits.