Hello.

I'm using the source Impact 2.0, and there's a Buy 100 option.

The dupe works like this:
You buy 100 of one item.
Then you sell 100 to the General Store.
You will now get the value of more than 1 item, but only sell 1 item to the shop.

How can I prevent this from happening? It's instant & super easy, so I've disabled selling to shops for the moment. Anybody who can help me? I've tried alot of things, but with no results.