I have previously ordered some of the big Z Man grubs - including Motor Oil - from anglerswarehouse.com.au - they are based at Tweed Heads and do a good flat rate shipping cost to NZ, arrives in about three days. They deduct GST for international sales, so at the moment that pretty much eliminates the exchange rate factor. Very reliable, too. I read that the snapper winner in the Beach and Boat a couple of years ago caught it on one of the Z Man grubs (pink?).
I saw some of the big grubs in a bargain bin at the Top Catch in Half Moon Bay a little while ago.
I've also ordered Z Mans from the US (tacklewarehouse.com and protacklesolutions.com). They do free shipping to US addresses, so you just need to sign up to a NZ Post You Shop account (which is a US mailing address in Portland), and it's about $NZ20 to get the lures back here. YouShop charge in NZ dollars.
At $US3.99 a packet for some lures, it's a steal compared to the best retail cost available in NZ - which is usually $12.99 with a Smart Marine card. And you have a much bigger range to choose from, including colours and styles we don't get here.
Protacklesolutions has some big shad and paddle tail Z Mans which I imagine would do the business on pelagics.