Just got an email about Jetstar's Launch sale for their Hawaii leg that comes into operation from December 2012.
Travel is for select dates between Jan - Jun 2013.
I had a play around with dates and there are weekend as well as mid week flights.
The cheapest I could find was $328.86 return ($199 up and $129.86 on the way back).
The usual conditions apply (no checked baggage, booking with credit card costs extra, etc).
Appears to finish at 8pm tonight, but still a massive bargain if anyone is keen!
Booking as we speak lol