Instead of showing total stack price show the price per item and total price in parenthesis (or swapped, but then please give some config option to change it).
Example:
instead of showing price 1s 70c for a stack of 10 items show 17c (1s 70c)
where s is silver coin icon, c is copper coin icon.
Example:
instead of showing price 1s 70c for a stack of 10 items show 17c (1s 70c)
where s is silver coin icon, c is copper coin icon.