I combine shipping.  Buyer needs to request an invoice before paying so i can adjust the shipping cost.

Please note:

Ebay charges Seller's fees on the shipping, and a final value fee on items sold.
PayPal also charge sellers .30¢ for every transaction plus.
When a refund is issued thru PayPal, eBay doesn't issue a refund on the fees that the seller had to pay.

If try to buy more than one item from your Smart phone here is some helpful tips to be able to request an invoice:

*Click on BIN
*Click on purchase
*Click on commit to buy
*Click on ca11ncel ~ it is on the upper left corner
*Click on exit where it says payment required
*Complete the above for all the items that you are wanting to purchase.
 Then you should be able to request and a combined invoice

 
On weekdays, I ship within 24 hours of payment. On weekends, I will ship your item on Monday.