This is a historic low on Amazon AU. It's currently $56.98 at JB and $64.99 at Sanity, for comparison. You can watch it on Stan in HD, but if you want to see the documentary in all its HDR and …
Thanks to huanlin's post you can get both Planet Earth series on bluray for $29.98. If you're lucky you can score the JB Exclusive version of Planet Earth II with the animal magnets. …