One other idea: pre-printed cards can be used for
Any Hero mail for Operation Write Home.
If your aren't familiar with OWH, it's a group of cardmakers across the country who make cards for our troops deployed overseas to write home on. Cardmakers send their creations to an OWH shipper, who sorts the cards into a nice assortment, boxes them up in batches of 350 blank handmade cards and ships them to a deployed unit.
Also in each box, they include 'Any Hero' mail--which are cards with a 'Dear Hero' note of appreciation in them that the unit contact can give to someone in the unit who might need a morale boost.
The Any Hero cards can be hand made or preprinted. As for getting the notes written, you could work with, say, a Scout leader, teacher or youth minister if you have kids in such activities. I've invited neighbors over for coffee, visiting and note writing.
The notes don't have to be elaborate--just an acknowledgment of their service and maybe a little something about everyday stuff in your neck of the woods, to share a taste of 'life back home' with them.
Anyway, that might not make much of a dent in your preprinted card supply, but even a few letters would be much appreciated by OWH and the troops they went to.
If you're interested, you can find more info on OWH here:
Operation Write Home: Helping Heroes Keep in Touch with Home