So far I haven't heard of the dvds being released outside Australia but maybe later on they might be released.
You could buy the Australian dvds but you'd have to make sure your dvd player could play region 4 dvds. There are a few Australian sites that have the dvds for sale. I normally buy from
EzyDVD or
Sanity. I've never had any trouble with either of them. There's also ebay but you have to be really careful about buying things through ebay.