Send free Kleenex to a friend
Then share the recipient's name, e-mail, and address. If you're worried about signing your friend up for spam, consider using an alternative email address of your own. I sent a pack to my roommate, so it is possible to send the freebie to someone in your own household. You can add a 50 character message as well.
Caveats: valid in the U.S. and Canada only. Your free tissues will arrive in about two weeks.