I've been on a search for a Costco equivalent in NZ and it has been hard but I've come across a store called Gilmour's which looks like it may just do the job. They sell single units and by the case. The more cases you buy the cheaper the unit item. I need to scope it out but it may be a good place to do some group shopping as it'll be cheaper that way. Here is the onlinecatalog. If anyone other cruisers are working on provisioning and want to check it out with me and possibly split some cases of stuff I may be interested. Just let me know. Could be a fun group outing.