Where can you get Naturally Sadie on DVD?

I love Naturally Sadie a but my friend does even more and she has gone in to a depressive spiral because it is airing on abc in AUS at the moment and its got the last episode of the third season to go. So because her birthday is coming up soon I was wondering if you could get it on DVD so she could watch it whenever she wants and so she could not be depressed any more?