U.S. buyers may request a total from your cart and I will send you an invoice with the correct shipping. Please note that you can only do this from the website. The app does not have this functionality. As an alternative, you can pay the shipping up front and I will refund you the difference when I box everything up.
International Buyers may not request a total. Ebay's global shipping program does not allow it (please complain to them). The only option is to pay the shipping up front and I WILL refund you the difference when I box everything up.