Hi more info for you , The following is the massey application criteria. Pretty relaxed, GMAT is optional.
http://gsb.massey.ac.nz/massey/depart/c ... ations.cfm
http://gsb.massey.ac.nz/massey/depart/c ... ucture.cfm
43000 NZD all up + living expenses.
Massey is an outer western suburb of Auckland, Albany campus (where the MBA will be held) is even further than massey - in far north of Auckland, pretty far from the CBD. Not sure the networking aspect will be optimum there. Networking may not be relevant for you if you plan to return to your company post graduation anyway.
Another viable option in Auckland is the University of Auckland, widely regarded as the best university of New Zealand. The business school is right in the CBD. However the quality of degree has been questionable in the past. This might change in the future after the construction of a brand new b-school building (again in the CBD campus):
The entry criteria is even more relaxed than Massey.
Once again I would like to emphasize the monetary aspect of pursuing these degrees. The Australian MBA programs and AGSM and MBS are much more renowned and offer post graduation opportunities in Sydney, Melbourne and rest of Asia, and cost only marginally more than the NZ programs.