Portrait cards can be customized with your choice of font, image, and message on front and inside (see here for wording resources and suggestions).  Pricing is $25 for the card setup (you will receive proofs of the front and inside of the card before printing) which includes the first 10 cards & envelopes.  Additional cards are $1/card, including envelope.  Portraits can also be printed on address labels, or you can purchase the digital image to put on actual postage stamps.