There is a guy in West Auckland that had a work injury and can't work any more. He was a service technician at a factory that makes office chairs. He now repairs/refurbishes them at home and sells on TradeMe. Send me a PM if you want to get his details. Basic chairs are around $40, goes up to I think $75 to $90 for a high back Spectrum 3 (which retails around $600 I think) and he also has fake leather executive chairs for around $100. Any problems he is quick to replace faulty parts for you.