if i search for motherboards on amazon, i get 100's of results, but if i click 'ship to australia', i only get rasberry pi's, supermicro intel one, and server amd ones? every other computer component ships to aus, but not mobo's.
I dont know to be honest and I cant seem to find any info on it (there is a post about it on linus tech tip forums but the site seems to be down at the moment). However I believe newegg.com will ship mobo's to Australia.
Amazon.com (the U.S. site) only ships about a third of its product range to Australia. Customs is the main issue. If you get stuck ordering something (doesn't have to be electronics), https://flycrates.com ship Amazon to Australia.