Thank you for your idea in regards to AccountRight and pricing of items
AccountRight does have a pricing matrix. This is where you can set on the customer's card what price level the customer falls under and therefore what price items that do get when sold. For more information the pricing matrix please see Help Article: Custom price levels
Is what you are after with your idea covered by the pricing matrix on item or where you thinking more on a short term level where you get that this item is "on special" and therefore customers who purchase that item get an automatic discount in the price?