A lot of schools' playground in Auckland have what one needs to do boyweight exercises i.e. chin-up bar / monkey bars for chin-up, dip bars, running tracks etc. Schools run 8am - 3:30pm here so go outside of this time.
P.s. Causal entry to gym costs about $10NZD per entry on average.
You can find health product shops in shopping malls. NZ produced protein powder is not expensive.
Can't tell though how good they are compared to Surge, Grow! etc. because I am raising the same questions to other NZ guys on another thread. Maybe other New Zealanders on board can answer that question.
And of course, enjoy NZ GE free foods.
Not sure about this statement but I wouldn't be surprised given known the amount of milk NZ produced each year.