Seems to be very cheap for Qantas and direct flights.
EDIT: Direct flights only for Brisbane, Sydney and Melbourne.
Travel periods are August to December 13 and January 17 to March 31.
Not too sure about the end date for the sale but it should be around the date I set.
" For card payments on international bookings at qantas.com, add A$30 for credit/charge cards or A$10 for debit/prepaid cards including Qantas Cashâ„¢, per passenger per booking."
Of the above, only BNE, SYD and MEL are direct flights.