Guittard in Australia
I have tried Guittard chocolate in the past from an American friend and liked it, but haven't found a local, Australian, source until now. USA Foods in Melbourne seems to now be stocking a limited range of Guittard products, including bars:
I have ordered from USA Foods before without any issues. I know that some DJs stores also stock USA Food products, so maybe you can get the bars in DJs, although I haven't seen them.