Hi there,
The extra shipping charges incurred are US import duties and taxes. We have no control over these charges nor is Xtreme Caliber Performance LTD the ones billing you since these charges are duties, taxes and tariffs billed to you by the courier (UPS, FedEx, etc.) on behalf of the US Government. We cannot control, change or influence these charges in any way as they are directly controlled by the US Government. The shipping charges billed on the invoice are for the physical shipping costs to take the items from one place and deliver them to you, these costs do not cover any import charges.