I bought quite a few G1 Transformers from this record store near Camberwell Station and Animezone in Box Hill had some too. Likewise Comics R Us in the CBD. But that was ages ago and I've heard reports that the places in Camberwell and Box Hill don't stock as many G1s as they used to (don't know first hand though). But I suppose if you happen to be passing through those areas it might not hurt to look?