Tairua: Te Moata - Offers regular Insight Meditation retreats and many other workshops. - http://www.temoata.org/
Christchurch: Southern Insight Meditation - A non-profit, non-sectarian group run by volunteers which makes available the teachings and practice of Insight (Vipassana) Meditation through retreats, courses and talks. - http://insight.orcon.net.nz/