I am a Kiwi.
What stock on the NZX or the ASX do I need to buy to take advantage of these crazy low oil prices?
US here, so I'm not familiar with NZ companies. But look at major suppliers to oil refiners or the oil refiners and producers themselves. But be warned, it might not be until 2017 that oil prices rebound so make sure whatever company you invest in has a strong enough balance sheet to whether an extended time of reduced cash flows.