This was posted over on CAG.com, so I can't take credit. Basically if you have Kirby Canvas Course, and you register the game using the PIN code inside the game case using the link below you get this shipped to you for free. Here is the link:

http://www.nintendo.com/stylus_offer/

Also, there have been reports that this is close to what the freebie in question looks like:



Quantities are limited! HURRY!

-Chris