I am not sure how the export rules work with kovachii, but I would check with Piping Rock Orchids first. They were the original source for flasks in the US- I had a few of that first batch, and they were pristine- and while they do not currently list the actual sizes and prices of what is available in kovachii, they do have the species listed with a "Please Inquire" notation.
First class operation over there, plus they are part of the international syndicate (my choice of wording) that has been introducing the species in a responsible manner worldwide. If they do not have flasks at the moment, or if they cannot ship to you in New Zealand- I am confident they will give you the best guidance as to alternative legitimate resources available to you.