Post Office and SpongeBob work together

Have your message delivered by SpongeBob

Washington Post December 5 2013

http://www.washingtonpost.com/lifestyle/kidspost/have-your-message-delivered-by-spongebob/2013/12/04/dc77fed6-5c58-11e3-be07-006c776266ed_story.html
I stopped by a PO in Arlington, VA today, but didn't see any of these postcards. If anyone sees them, please note where in the comments.