Howzit Martin
Unless you have firearms that are of unique or historical significance it's probably not worth the hassle of getting them out of South Africa, particularly if they are semi-automatic. Here is a general overview of domestic firearm laws if you're unfamiliar:
https://en.wikipedia.org/wiki/Gun_laws_in_New_Zealand
Below is a list of some well known retailers and / or auction sites that you can peruse and get an indication of what's available, prices and so on:
www.guncity.com
www.huntingandfishing.co.nz
www.reloaders.co.nz
www.seriousshooters.co.nz
www.kilwell.co.nz
gunsnz.com
www.gunsupplies.co.nz
Burley Arms
www.trademe.co.nz
GunStuff.co.nz
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