A pretty neat thing for young kids, and even has a special Santa postmark for the budding skeptics! These range in price from about $5 - $10 USdollars.

There are a few of these offered if you do a google search for letter or phone call from Santa but I have included a link to a couple as well. Some are available worldwide. Or if you are handy with the computer, you can draft one up yourself and slip it into the mailbox after the mailman has passed by.

http://www.santamail.org/

http://www.greetingsfromsanta.com/

http://santaletters4kids.com/