Australia
NUMB3RS runs on Network Ten and started airing August 15, 2005. The series is currently not running.
DVD news:
Season 1 — October 5, 2006 (region 4 DVD’s are only the episodes, none of the bonus material is included)
Season 2 — June 7, 2007 (region 4 DVD’s are only the episodes, none of the bonus material is included)
Season 3 — July 9, 2008 (extras ARE on this set)
Australian sites:
Network Ten NUMB3RS page
New Zealand
NUMB3RS began on TV3 July 20, 2005. The second season began July 16, 2006. The third series is currently airing on TV3 (thank you Anna for the update!)
DVD news:
New Zealand sites:
TV3 NUMB3RS page