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Just a couple of links that might be handy if you're looking around for some extra competitions.
https://en.m.wikipedia.org/wiki/List_of_shopping_centres_in_Australia
https://en.m.wikipedia.org/wiki/List_of_radio_stations_in_Australia
Most shopping centre competitions are pick up only so best to stick to what's around you and radio competitions are usually state based. Good if you have the time to have a look :)