Business opportunity

My sister emailed me over the weekend to say not to try emailing my mother, who just moved, because her email is not working. A little later I went out to the bookstore, and as I passed their huge selection of cards I realized that I needed a sympathy card for someone whose email is not working. Why hasn't someone invented that? How could it lose? It's the only kind of card that can't possibly be put out of business by an email.