I do combine shipping for US customers only. The shipping charge should update automatically when 2 or more items are added to the cart. If you make an offer on multiple items and I accept the offers, Ebay will automatically process the payment(s). I will send a refund back to you on any extra shipping charge you pay minus the first charge of $5.95. I usually send the refunds when I print out the shipping label and you will receive a message from Ebay when the refund has been processed.
Please send me a message if you have any questions, thanks!!!