Found this deal while shopping for an air purifier. Lower price than the best on OzBargain and priceMe/priceSpy.
Running costs for the filters seem to be around the $160 per-year mark (~$50 for a year of carbon filters, $115 for the HEPA filter every 12-15 months, $30 for the UV bulb every 2-3 years). Reviews seem ok and worth noting is that it uses a proper HEPA filter where the Z1000 and Z2000 do not.
I ordered yesterday and it was dispatched on the same day.
The $199 price is Ex GST.
Price incl GST is $228.85 with free shipping