There is no patent cover in Australia so anyone can effectively sell whatever crap they want and get away with it. I suggest you avoid SkyRunners or MoonBoots, both have cropped up over there.
You effectively have 2 choices in aus, powerstrider from
http://theweirderthebetter.com.au (Naz, I'm guessing it's ok for me to link as it's not in the UK?), or airrunners from
http://airrunner.com.au/AirRunner are the discontinued UpWing line, which were cancelled due to quality and general mechanical problems, so I would definately avoid those. Also they're regarded as a bit of a joke in the bocking community as they were extremely hyped and regarded as "the next thing in bocking" in the community before release, only to be discontinued a few months later. Over here they were called "ProJump Elites"
Basically, leaving you with powerstrider, which are ProJumps, just under a different name. So, good quality and very good for beginners. Price is a little steep though compared to the UK Price (£50 more!).