You can find cases on the following websites.
You will need to know the name of court or tribunal, the year of decision and the names of the parties.
This Guide has been developed by staff of the Legal Information Access Centre (LIAC), State Library of NSW. The State Library holds an extensive collection of case law, legislation and looseleaf publications.
Not all cases are available.
Courts select and provide decisions for publication, usually on the grounds of legal significance.
Just because a case is well known doesn't mean that it has been published in print, or on the internet. If you know the names of the parties, you could try searching on a case citator to find it on the internet.
If you want to find out more about citators, use this guide: What is a case citator? produced by Macquarie University.