If this was a class project, the teacher would write the address and the kids would write the message (if writing is still taught)
With millions of post cards coming in, no one is going to spend time sorting the cards by State or zip code. well, I hope not, it'd be a waste of money, they might get a Grant. hm
One can be creative! There's the typewriter and computer. There' a ball point pen, a fountain pen, magic marker, sharpie (Trump's fav), crayons....chalk. There are a variety of colors. Then one can practice being ambidextrous.... cut out the words from a magazine (LOL)
That's at least a dozen post cards right there.
good deal we just need there attention....