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I'm in Australia.  What should I look for in an online stock broker, for trading mostly on the ASX?
I don't know where your trade figures are from. ETrade, TD Ameritrade, Fidelity, etc all have trading costs under 10 USD per share, so I'm not sure where your costs are coming from. I doubt currency conversion or anything like that will double the cost. As for your question, the answer is: It depends How much trading will you do? In what types of investments? For example, Schwab charges no commission on ETF purchases, but this is not an advantage if you wont buy ETFs. Consider minimums. Different brokers have different minimum cash balance/deposit requirements, so make sure you can meet those. It's true that you can get real time quotes anywhere, but consider the other services. For example, TD Ameritrade pools research reports for many publicly traded companies which are nice to read about what analysts have to say. Different brokers given different research tools, so read about offerings and see what's most useful to you. You can open different brokerage accounts, but it's much more convenient to have a one-stop place where you can do all you trading. Pick a broker which is low cost and offers a variety of investments as well as good customer support and a straightforward system.