Fidelity.com was recommended to me by Rusty. As it is a low stock price, you will have to go through the international trading office. You will have to set up an account on line first, fund it - which take 3-4 days, then call the international trading office at 1-800-544-2976. You will not be able to make this trade on line due to the price of the stock. They will give you the exchange rate for the Australian dollar, what’re that happens to be at the time of the trade. It was app $1 US to $1.35 Australian.
I was able to pick up some shares through TD Ameritrade, however you I believe you pay a premium as there are not many shares moving on that exchange. IBX in the US is IBXXF through TD AMERITRADE. Through Fidelity you can buy it as IBXXF with US dollar or IBX:AU with the exchange rate. I am not familiar with the exchange rate process, however there are many more shares of IBX moving on the Australian market then with TD Ameritrade.
Fidelity will charge you a commission and a exchange rate fee, which will run a little over $100 for 30,000 shares, perhaps $150 for 50,000 shares. Fidelity will give you an idea of this cost before you place the order.