Just saw this posted on another forum and thought I would pass it on.
If you are wanting to fly from Melbourne or Sydney to Bali on Jetstar 2 for 1 deal!!!
You can only access it if you go into the Brisbane to Bali search on the take a friend for free banner - you put in your dates and then go to the top and "edit" change it to Melbourne or Sydney. There were still flights left in October in the last half an hour or so.
P.s. If you try to do a normal booking via their website you will not be able to access the 2 for 1 deal.
Good Luck......