10. The computer-readable medium of claim 9 , wherein the user interface component further comprises: a price indicator indicating a price of the combination of items as a unit, wherein the price indicator is displayed with the combination of items in the user interface component and is automatically updated as displayed upon selection of the substitute item.
10. The computer-readable medium of claim 9 , wherein the user interface component further comprises: a price indicator indicating a price of the combination of items as a unit, wherein the price indicator is displayed with the combination of items in the user interface component and is automatically updated as displayed upon selection of the substitute item. 11. The computer-readable medium of claim 10 , wherein the price indicator further indicates a price for each item in the combination of items.