In response to AirAsia's sale, here is Jetstar's offer. For travel Tuesdays, Wednesdays and Thursdays flights only. I guess you can still use the price beat on AirAsia's fares seeing they only need to be on the same day not 1hr apart.
Return prices below:
Without Baggage(how!)-$125.66
With Baggage-$165.66
or ONE WAY $89
TRAVEL: 20 Jul - 22 Sep 2010, 12 Oct - 7 Dec 2010
ENDS: Midnight Thursday
Damn! I wish I still lived in Perth