It seems like there's a stream of news item since 2017 about Costco opening in New Zealand, but never actually happens.
The latest I saw was from May this year: Costco has started recruiting managers for its Auckland superstore ahead of its opening early next year
But their NZ job site has no vacancies
I'd love some competition in the grocery monopolies.
Here's a video called "Why Costco is Cheaper than Amazon" (I have no affiliation with Costco)