http://atlanticdvd.com.au/index_stuffer.cfm?view.cfm?id=6486~content
Try this place - but youll be needing a region free dvd player to view it.
I googled 'I went down dvd' - there are a few places you might get it - all international delivery.
Such a shame, its a great movie, wonder why its not available easily on dvd?
You might also try local Xtravisions or Chartbusters in case they can sell you a second hand copy?