http://www.sunskis.com/send_me_a_postcard.html

Have a friend living in a far away place? Want to send a pretty picture to Mom? We've got you covered. We'll send an awesome postcard anywhere in the United States to anyone you like, for free! Just enter the recipient's mailing information, a short message (if you like), and voila! We ship a lot of stuff around here, and we like snail mail, so this was an obvious feature we couldn't resist. There's nothing like getting something in the mail.

Yes, it's FREE!