As far as I can recall, the different brands of malt available in Australia to the homebrewer are:
Bairds
Weyermann
Powells
Joe White Malting
Hoepfener
Have a browse at the manufacturer's websites. Don't bother with Joe White, they point you to brewcraft.
The Weyermann site is pretty comprehensive, the link is in the links section on this site.
Many of the homebrew shops, for example Grain and Grape in Melbourne and Eastern Suburbs brewing in Sydney have details on the different malts on their websites.
I've always bought mine from G&G in Melbourne. Their stock appears to be fresh whenever I order and the malts do make very tasty beers along with excellent extraction rates. I usually buy JW or lately Weyermann's.