Just had a look here:
http://www.4wdsystems.com.au/gfx/specials_2.pdf
I beleive the 4WD Systems LOKKA is what the Aussie Locker is marketed as over here (Aussie Locker isn't sold in Australia). Seems they sell for about $600-700 locally. They sell them for US$240 in the states so there should be a cheaper option somewhere.