For Nz passport, is there a dimension (mm) requirement or just ratio? Do they use the digital copy to put on the passport?
What's the choicest method to get your photo done? Warehouse stationery? Can you print your own at 50 cents or whatever they're charging per page?
edit: For new passport
https://www.passports.govt.nz/passport-photos/ has all the info.
You can take and print your own as long as it fits the spec, but from memory they are quite strict.
it's usually around $20 to get it taken, emailed, and printed from a local photo store or NZPost.