The shipping cost is calculated by the system after you select the goods. You only need to call the seller after placing the order and ask the seller to change the shipping cost back in the background. Basically, the seller will call you after seeing the order to ask if you are sure you need this batch of goods and then help you to adjust the shipping cost (or you can ask the seller to change the shipping cost yourself). So as long as you do not pay directly but discuss with the seller and let the seller change the price in the background, you basically do not need to worry about the change of shipping cost when submitting the order