You could try the following:
(Copy and paste into Google search)
"mortgagee sale" -"NSW" -"QLD" -"ACT" -"TAS" -"NT" -"VIC" -"SA" site:www.realestate.com.au
This will search on Re.com.au for the words (mortgagee sale) and take out those individual phrases (all states apart from WA)...