City - Tullamarine Before was $16 for one way and $32 for round trip.
Now $15 for one Way, $28 for round Trip
Could combine with 15% cashback with Shopback: https://www.ozbargain.com.au/node/459042
City - Avalon also on sale:
https://www.klook.com/activity/11758-avalon-airport-express-…
$20 one way (was $22.8)
$36 round trip (was $43.7)
Use code mobile10 for 10% off
$13.16
( works on app, haven’t tried on website)