When you buy more different items, please use Add to Cart.
Put all items in your cart, then Request Total before paying.
Then Ebay will let me know that I should send you a combined invoice.
And you will pay only for that invoice.
First item will be the highest S/H and there will be additional costs for the rest. Different items have different additional cost depending on size and weight.
If you can't request total, there can be two solutions :
Please use only www.ebay.com, and not local ebay sites.
Please buy on computer, and not on mobile phone.
If you have any question, feel free to contact me.