Don't know if they'd still have stock but I was able to get one from Sandy Point -
progressivesports.com. I'm sure they'd ship to OZ and they're really helpful and well informed, especially if you speak with Steve Gottlieb. That track is the same as the one on the original Kona CarbOne, and it can definitely get banged up enough to be unusable if you don't lock it down when not actively using it.