In any shop, choose a character who has a Gem Bag, Scroll Case, Potion Case or Ammo Belt. For example, if you want to buy all the Scrolls Of Protection From Undead from a certain shopkeeper, have the character with the Scroll Case select the scroll with by double clicking so you buy more than one Item. Select all the scrolls the shopkeeper has to offer. The price will reflect every scroll you are going to buy. After that, go to the character's inventory. Double click on the Scroll Case. This opens the case for only those items allowed. Go back to the shopkeepers inventory You will see the multiple scrolls you selected by the small number in the upper left hand corner of the item. However, the price will reflect only the cost of one of those items. you Can buy as many of the items as the shopkeeper has to offer for the price of just one.