We do combined shipping.

The total shipping fee is is the same no matter how many cards you purchase unless it's not a big size item. So 1 card or 10 cards are the same shipping fee.

You can send me a total payment request or if you can't due to the promotion sale of the listing, message me after you purchase them in 1 order. Then I will refund the extra shipping fee which is over $6. 

Note : For some countries, the shipping fee can be more. We will contact after the purchase. You can decide whether you want to keep the order or want a refund. We follow the buyers' decision.
For countries which standard airmail is NOT available. Expedited mail is possible. (EMS costs $20-37). We will give you info.