Office of State Revenue: 

https://www.apps08.osr.nsw.gov.au/erevenue/calculators/landsalesimple.php

Land & Property Information 

www.lpi.nsw.gov.au

Real Estate 

www.Realestate.com.au

www.domain.com.au

www.propertyobserver.com.au

Borrowing Power Calculator 

http://www.realestate.com.au/blog/borrowing-power-calculator