As a matter of fact, yes, the ERSA is available online.
Go to
http://www.airservicesaustralia.com, click on Pilot Centre, in the upper left corner theres a box called Pilot Services...click on Publications. Click on Airservices Australia Operational Documentation and follow your nose from there.
Its all there...if you're interested in the DAPS, they're there too.
Hope this helps.
HP