LvH I guess you are referring to the monthly costs when you have more cards active than your subscription allows?
You can activate your new card as soon as you see it in the app and then freeze it temporarily (beware not to deactivate it permanently) until the actual card arrives. Then freeze your old card and unfreeze the new card.
This way you will never have more than the maximum number if cards active in your subscription at the same time and won’t have extra costs.