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http://www.Langwoodsphotography.co.nz in ChCh
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http://www.photodigital.co.nz in Auckland, Browns Bay
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http://www.astronomy.org.nz - the Auckland Astronomy club shop, I believe. selling the brand GSO.
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http://www.trademe.co.nz with 2 sellers operating from Auckland and Wellington.
They all have only a tiny product line in their online catalogues.
http://www.ebay.com for adaptors, camera remote, small items.
from outside NZ (assumption - they deliver to Oz, so...)
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http://www.agenaastro.com (USA)
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http://www.astroshop.eu (Germany)