Certainly. For one deck, a padded envelope to most international locations is about $13.00 for postage, plus the price of a large padded envelope, plus insurance. About $16.00 total. For two decks, the price jumps to $16.75 for postage alone, plus the envelope and insurance, or about $20.00 total. Make it three decks, and the price jumps again.
We chose Priority Mail because unlike a padded envelope it's a sturdy box to protect your decks, and because the price doesn't change when extra decks are added. For best value, of course, it makes sense to pledge for more than one deck. And if you can help us reach the higher stretch goals, you'll automatically get an extra deck or two for the same price, with no increase in shipping.