I've only transferred / had transferred internationally sums around 50-100k, that was just a nominal fee.

http://www.stgeorge.com.au/online-services/business-banking/...

Telegraphic Transfer (TT) Request $20.00 per transaction or item

Pretty sure that would be fine up to ~$1 million. Anecdotally I know TT happen for sums in the range of $10-$100 million (there was a case where ~$150 million was stolen by a rogue TT in Australia to overseas bank accounts).