Single cards can be mixed and matched any way you want. Each card is $3.00. There is a minimum order of 6 cards, which includes 6 envelopes, for a total price of $18.00. The 6 cards come in a sealed, transparent package for protection, which also makes them perfect for gift-giving. For an order of 12 cards (which comes in two packages of 6), let me choose an additional one for you as my way of saying "mahalo" (thank you) for your order! For an order of 18 cards or more, the cards will be discounted, so please email me with your request. You do not have to order in multiples of six; if you wish to order, say, 9 cards, that's fine, but remember, there is a minimum order of 6 cards. Shipping is built into the price so there is no additional shipping charge. Please allow 10 business days for delivery and mahalo for your interest!