I watched "in my father's den" about a week ago in Ireland and I loved it so much than the first thing I had done when I went out from the movies was to try to find the dvd on the web and as I use to buy my dvd and cds in ebay auction, I was quite happy to find what I was looking for. Good luck for your quest, so.
Pray, apologise for any mistakes i might have done, writing in english rather than french, my native langage, is not as efficient as it should be.
try http://www.ezydvd.com.au
"Remember today, little brother. Today, life is good."
there's an Australian dvd shop price search here...
http://www.getonce.com.au/dvd.html
I'd recommend ezydvd (as the person above said). They've got a heap of stores Australia wide and only sell dvds. Never had a problem with them from within Australia and they definitely import to other countries. It may a dollar or two cheaper elsewhere, but ezydvd would be the safest way to go - I would call them the Amazon equivalent for dvds in Australia - maybe not the cheapest, but not a rip-off either, and they're reliable.