Where to put an IntValue (Used as cash value) for least chances of exploiting?

I want to make a cash value (not on leaderboard alongside the players name) that's an int value. I'm afraid that putting it inside the player or a screengui may increase chances of exploiting. Anyone able to help?

You can just make a folder in the player called "stats" and put the values in there. Remember that with FilteringEnabled anything that the client changes won't replicate back to the server.