If they're the frozen wedges then they're 2 syns for 100g.
As for the pizzas, I'm not sure which ones you mean. The only smart price one I can find is the 268g one, which is 16.5 syns for half of it. The frozen mini ones (12 in a pack) are 3 syns each but I don't think they're smart price ones so might not be what you're looking for. If there are other ones it might be that they're not on the SW website yet.