Came across this deal looking for a cheap skybus option (I know about the PTV option)
SkyBus Melbourne Tullamarine Airport (MEL) Express Transfer Ticket
Non-refundable
Mobile ticket
Fast and convenient airport transfers to Melbourne City
Book an open-dated ticket for a more flexible traveling experience for you and your travel group
Access to WiFi on board, ensure you can share every moment on the journey with your families and friends