Australia has only three volumes so far which has also been released together in a 1-3 collection set that the US was cheated out of. But now their releases continue with a new volume 4. That volume also has a region 2 foreign release too. Another region 2 foreign releases from another company include Season 2, Part 1 and previously released from the same company Season 1, Part 2.
So if any of those languages apply to you then be sure to get them if possible.