Failing television,Region 4 [Australia]best way to go, if you are a big fan like me, and dont mind footing the change.You can get Season 8,which is a three disc set and includes the remaining four episodes of Season 6 and the first nine episodes of Season 7 (Back to the Woods - The Juice Is Loose).It also includes some neat special features like commentaries on every episode, deleted scenes, and featurettes including footage from Comic Con 2008. Thats the best I can tell you as I am from the States (U.S.A.)Also I believe the distributor is FOX home entertainment.
I will try to find out more if I can, (like where on net you can buy it if at all interested)
Please feel free to drop me a mail if you care too. It would be my pleasure to help if I can.