Gas Gas Australia... through your local dealer, or any dealer of your choice. Give Scottys dirt bikes a call. They can probably hook you up with the fork spanner too. http://www.scottysdirtbikespares.com/contact-us.html I've bought pleanty of parts through them with nothing but positive reviews.
I doubt they will be in stock in Australia if thats what you mean. They would more than likely have to be sourced from Spain, which means dealer -> Solo Imports -> Spain plus delays.
Is it just the stickers that are trashed?? Or are the plastics shagged out too. You could easily order a new set of OEM plastics with newer 2011/2010 Nambo stickers and you'd be blinging. Otherwise you could do as I have done and order a custom sticker kit. Much cheaper than OEM and designed how you want. http://www.ridepg.com/product_pages/gasgas_products/gasgas_products.php
They don't list shipping to Australia through the checkout but I emailed them and had no issues at all getting the design to look the way I wanted. I highly recommend.
Thanks or that info, yeah my local dealer was trying to find oem graphics which I would like to have spare so that when update it one day it will look original