Saw the 1TB drives in the Smiths City catalogue, their 4TB drives are well priced too. The 1TB drives come down to $89 semi-regularly, but pricespy says only once before around this price.
The 4TB drives have been down around $180 recently, and can be had bit cheaper from Amazon (black $159, colours closer to $169) but I think this is still a pretty good deal at the moment for a local retail 4TB drive. Current next cheapest is about $40 more at PB Tech.
Most are in-stock now, I did notice for the red 4TB drive it says "We'll order this in for you" but it's still available I guess.
Delivery says estimated $6 to Auckland City but you can collect free from a store as well. Might be different delivery charges around NZ I don't know.
Dont know about wd but got my seagate 4tb for $137 not long ago.