The information from Nbn Co is at this link:
http://www.nbnco.com.au/develop-or-plan-with-the-nbn/new-developments/government-policy-for-new-developments/end-user-contributions.html
Unfortunately, the best hope is to try and negotiate with your chosen ISP to perhaps only pay one of the connection fees and see if it will absorb the other for the second connection at your new place.
