I combine postage on all items. auction & Buy it Now

 If you are using the eBay app on an i-phone you cannot do this but if using a computer, laptop you can use the cart for multiple items. Select what you require, commit to buy each item and when you are finished request an invoice for combined postage. (Ignore automatic prompts from eBay asking for immediate payment.)

If you cannot do this then I will refund you excess postage