You will struggle to buy a good compost product from most retailers in New Zealand. One way around this is to control the composting process and make your own. There a few routes to making compost and it will be both input and scale dependent.
For good quality compost apart from the right ingredients you have to put in some effort and we managed to do so. We soon realised that turning compost is a bloody good exercise and takes up a significant amount of space. Let’s put it in a cage to create more space Elain Ingham (soil food web) style, ugh there’s that turning again.