Then make it so that when the player does the cheque, it asks him what item, player, and price. Then if the player has that amount and the other one has that item, then it does the trade.
so it's just like a portable trading house?
__________________ "I’m starting with the man in the mirror
I’m asking him to change his ways
And no message could have been any clearer
If you wanna make the world a better place
Take a look at yourself and then make a change" -Michael Jackson (Man in the Mirror)