Combined shipping is available if you are purchasing multiple listings/items. If so, make sure to not pay right away but during checkout so you can buy all items at the same time. If you want, you can select to request a total or an invoice for your entire order before paying. Be aware that if purchasing multiple large/heavy sets, it might be better to pack each individually to ensure they are transported safely.

I am a long time eBay user including as a seller (check out my other accounts wookieenookie, immovableobject, and comicscrazeguy) and have a great track record.