Our topping price is per item (whether it's on 1/2 or whole). Select your size, and choose any toppings you may like. Then use the instruction box only if you want to modify a certain toppings placement. (Ex. Mushroom & Sausage selected. If you want both on the whole pizza, you do nothing, if You want them on only one side, instruct us as "1/2 Mushroom, Sausage. If you want them on opposite sides instruct us as "1/2 mushroom 1/2 Sausage).