Combined Shipping Instructions:
Step 1: Click Add to Cart for each item you want to purchase.
Step 2: Pay.
Combined shipping on most items I sell is automatic. For trading cards, the first card costs $2.59 to ship via Ebay Standard Envelope. Each additional card costs 15¢. For orders with more than ~10 cards, you can choose the First Class Package option in your cart or pay the full shipping cost and I will refund the difference.
I no longer refund shipping overpayments for buyers who choose to pay for each card individually using Buy It Now. This creates significantly more work for me than one might think, and it is quite unnecessary. It's much easier to use Add to Cart and process payment in a single transaction.