I have the Photoflex changing bag and love it - once you get the knack of setting it up it takes 5 seconds, and there's plenty of room to load a 5 reel film tank or 8x10 double dark slide..
I wonder if Badger Graphics will ship to Australia - for that price I should pick up a spare......
Option #3 = Make your own.... it's not difficult. Find a couple small diameter rods that break down - tent rods of small diameter. Then look at one of these closely and sew your own. An old changing bag can be modified simply by putting a couple loops on the outside. Yes, you need to make sure it's light tight at the seams where you sew - that's what Gaffers Tape is for.