Part of the Mitre 10 Black Friday deals.
Good price for this oil, although not as cheap if you were price beating at Mitre 10 with one of the automotive stores when they have it on sale. You might be able to price beat at Supercheap Auto, however.
Plenty of other items listed as part of the Mitre 10 Black Friday sale. https://www.mitre10.co.nz/blackfriday
Please comment any good prices they have on offer for other stock, as I don't know what other items are a good deal.