ADDITIONAL POSTAGE REQUIRED FOR SQUARE CARDS! This should be noted on their cards that won't go through the mail using normal stamps. We bought the square card set for our wedding thank yous and chose to upgrade to Papier to have good quality cards, which they are, but they cost $1.44 each to mail. This is not noted anywhere on the product page and it would be good information to have as everyone is trying to make their own budget decisions. For perspective, our $200 order of cards was already a lot, but worth it, and now we have $100 more to pay for postage.