I thought implementing a "Buyers' Offers" section might be maybe really useful, technically the same as the current "create a slot" function in the item sales, but for a Buyer Offer you would enter the amout of the items you are searching for and the price you want to pay for that item. Might help speed up item sales, plus you could easily see what items are required most and what people are willing to offer - this could be a pretty handy function for the market area...