PS1 games in Aus:
RPG's, seriously most RPG's fetch a good value on the PS1 so things like:
Final Fantasy Anything
Suikoden 1 and 2
Legend of Dragoon
Star Ocean 2
Legend of Legia
Also Capcom fighters seem to fetch a bit too:
Street Fighter Alpha 2
X Men vs Street Fighter
MSH Vs Street Fighter (both this and X Vs SF where Blockbuster only releases and are a little hard to come by)