A PC newbie here. I just ordered one of the Craftsman PC gun kits. The supplier has extra powder cups available for $10 each. Price seems a little high, and I don't yet know how useful the extra cups would be. Just getting started here. How useful would a couple extra cups be for different colors? I am really getting ahead of myself here, but can't help wondering if I should get the extras while they are still available....DanM