How do you go about finding out about art competitions in you're country??

I'm interested in entering a few art contests, to hopefully gain a little artist exposure, whether they be graphic design, painting or drawing.. but how do I find out about them?? I have looked on art gallery sites, government department sites, and tafe sites and cannot find information or lists of art contests for 2007, can anyone point me in the right direction to look.?? by the way I reside in perth, Australia.. so any Western Australian sites or contacts would be awesome but I'm happy to enter contest's from other states if it is a national contest.. Thanks