Here's a great sale fare from Tigerair, that can be used to Pricematch with Jetstar.
$30 fares are available for Melb-Syd, Syd-Melb, Melb-Adel, Adel-Melb, but get in quick as there's only 1600 seats all up.
Valid for travel 28th July to 16th September.
Happy travels :)
Pay with an Australian issued Mastercard debit card to avoid any booking fees.