Not sure if this is the right section to place this however was wondering if there is such a thing as an online or electronic ERSA? Instead of buying the book, just purchase a electronic copy and print the relevant pages at home.
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.