saved a pocketful of currency by chance booking via flight centre - came up cheaper than booking the flight direct or with a competitor like webjet. One day only, results may vary.
http://www.flightcentre.com.au/flights/domestic?int_source=i…
note: they did opt me in for insurance i had to untick, but overall much less bad experience than webjet addons.
"…for Domestic, Trans Tasman & South Pacific " flights only