[Tut] Shop Hack

Hello.
Someone bought from me item from shop which was putted for 900kk and i got only 1 geon...
Can you tell some hints? I'd to prevent from it...

ahahahaha lol spam -.- theard maybe you puttet in shop for 1geon isnt possible price is serverside

please report this thread this is not a TuT and i think price is serversided