@tango
Did you manage to get any Tu Si Zi?
pinyin Gou Qi Zi (wolfberry/Goji berry are some other common names), some on this forum have said that they like these berries. In my experience, paying attention to my taste and smell is a very good indicator whether something is going to be right for me, therefore I tend to pay attention to that as a guide.
They are quite high in antioxidants and are claimed to increase life span. Do you have any Traditional Chinese Medicine practitioners in New Zealand? If there are, they would probably sell you a small quantity so that you can try them. I do not know which eBay serves NZ but there might be some available there. I would recommend only getting a small quantity at first until you know that they fit well with you.
I am not sure what your customs would do if importing them.
I get mine from
https://www.realfoodsource.com
They offer the best price that I have seen and good quality. They ship to Europe but it does not say whether they would ship to other parts of the world. I have purchased from other sellers but they can be sticky which is not pleasant. They are dehydrated but they do absorb moisture if not kept sealed. I have left some out and they got more and more moist the longer they are left out.