Because I’m a really nice guy, I’m going to give up a bit of my baggage space to get a wad of these back to NZ for those that want something a little more IC;
http://www.darkbladeuk.co.uk/MISCELLANEOUS/Wineskin/p-89-183/
Using Westpac’s current exchange rate and adding a fraction of the postage to get them to me, it works to $23.50 for the large (2L).