Xiamen has a crazy sale on at present (see other deals listed in past day or so to Japan and other), and this is no exception.
Found on FlightScout, but their prices were showing higher. However maybe you could use their tool to find dates (https://www.flightscout.co/au/cheap-flights/melbourne-austra…) and then when you click through to skyscanner it's even cheaper.
(I know the coronavirus comments are coming, at least let's make them interesting ;))
you would have to be rather exceptional to travel via China and / or on a plane full of mainlanders anywhere anytime soon