If you are in New Zealand, check the Yellow Pages to find a Justice of the Peace (JP) in your area or look through the list on the Royal Federation of NZ Justices' Associations website. Otherwise you can contact AskOtago for advice.
Tel +64 3 479 7000 or 0800 80 80 98
A JP is available on the Dunedin campus most Wednesday mornings. Some University staff are also JPs. The Student Services Division page has more details.