Webjet Sale: Eg Melbourne to Sydney O/W from $25 (Jetstar)
Only just discovered this and it's been running for a couple of days, and finishes tonight, so get in quick!
Webjet has a 'BOFY' sale (this is a thing now?), and has cheap flights, eg MEL to SYD from $25 on Jetstar, Mel to Brisbane on Qantas from $169 and many more.
Travel dates seem to be between now and the end of September.
(Make sure to compare with the Jetstar Frenzy tho, Jetstar could even price match)