My main goal was avoiding making a request for a feature that already existed, while silumtaneously avoiding actually submitting a request to which there exists philosophical objections. Editing my current Daily Cleanup script to put things in at mall_price() would be trivial, though perhaps a little server-hammery.
As for mall_price(), I think I misunderstand the way it works. Does it always report the 5th item, or is that just once per session? I believe it updates when an item is bought, but does it update to the price just bought, or the new 5th item? Further, how does the mall_price() update interact with relay browser purchases?