how about function "Buy Item" in trade. you specify a desirable thing, specify the price you are willing to buy it. You will be debited from the account you specified amount of gold to the end of the trades. Anyone who comes in trade - see your offer and if it suits him sells it to you . if nobody was interested proposal amount (perhaps with less interest) is returned to you. This would be useful when finding things for the quests.
I'll see what we can do about that!