Just been browsing in Bramptins, the UK grocer shop, in Devonport when I spotted Jaffa Cakes. I recall that they've been mentioned a few times recently on the forum. They've even got enormous Christmas stocking tubes comprising six packs of JCs. Anyway, if anyone has the urge for JCs, Heinz sponge puddings or Ready Brek, you can order online and they deliver anywhere in NZ. Be warned, it could end up costing you a small body part!
The web site: http://www.bramptins.co.nz/
They also have shops in Browns Bay, Orewa and Pakuranga.