Preferably a place that doesnt take months to get the shirt to you would be good. If you can help, thanks heaps.
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My thoughts are my own and are in no way representative of my employer.
tonyhughes: Sounds like the OP wants to get custom printed tees within days/weeks, not vote on someone elses crowdsourced design and wait weeks/months to buy it.
Try your local screenprinters/embroiderer, I have used one in Hawkes Bay several times who delivered within 5 working days. They weren't cheap, but the product was good quality.
You might need to clarify 'best place' as you might get loads of recommendations for the best quality product in NZ at a higher price than anyone else, which is no good to you, if by 'best place' you mean cheapest price, or most-knowledgable staff.