I enjoyed visiting the wool museum en route from north to south island - https://www.newzealand.com/ca/plan/business/the-wool-shed-national-museum-of-sheep-and-shearing/
I last visited NZ 2012, so I don’t know if the same shops are still around. I found delightful shops within walking distance of the harbor (south?) Auckland. I had great luck asking for LYS and finding more reasonable prices of possum / merino yarns than in the touristy boutique shops.
Possum blends definitely need care and planning for garments that avoid abrasion. I made a lovely poncho with possum/merino that sheds like crazy and grows long with each wear after blocking. Hats and scarves work better with possum blends - not great for socks or working sweaters.