The buying/selling menu system in The Elder Scrolls games (Morrowind, Oblivion) kind of svcks. It takes forever to sell a bunch of different items. Many RPG games have a system where you can select all the items you want to sell/buy, have them listed in a "Buy/Sell" list, and then click "Sell" to sell them all. It's WAY faster and more convenient, I think. Simply have a list on one side of your items or the store's items. Then another list beside it of what you've selected for purchase (or to sell).