It's in print, on the shelves in the magnificently refurbished Law Library at K211 N333 - most recent issues on Reserve. Plus it's available elsewhere around the system - check the library catalogue for details.
It's online (from 2006) at the LexisNexis NZ site. And this is where it gets a bit tricky.
- If you access the LexisNexis NZ site via the Law Subject Guide, you won't see the journal (NZLJ) in the Sources list; but click the Journals tab anyway to get to the Journals search template. You still won't see NZLJ in the Sources drop-down menu, but if you search "All subscribed journal sources" it will include NZLJ from 2006. Or if you know the citation, you can use the Browse option to the left of the search template, and drill down to the year and issue that you want.
- If you access the site via the NZLJ library catalogue record (look for the Electronic resource - online options), you get taken straight to the search template and yes, New Zealand law journal appears in the Sources field - at least until such time as you navigate away from the search template, at which point you are in the same situation as at (1) above.
If you really want to explore the idiosyncracies of electronic access, try searching the CD-based NZLJ archive, (1925-2001), which you can get to via the Law Library computers: Start menu>Library resources>Law databases>NZ law journal archive. It has its own user guide - you'll need it.