If you have the right broker, you don’t have to worry about that. I’ve only suggested two: Schwab and Ameritrade (which may become the same company in the coming months). There’s no way I’d suggest anyone going with Merrill Lynch. They’re the ones that charged a subscriber for a foreign trade. I just don’t believe (personal opinion) that they have your better interests at heart. It’s why you’ve never seen me suggest them.
Personally, I’m not sure why 100% of people aren’t with the brokers I suggest. I don’t get any kickbacks from either of them. But there are reasons why I suggest them and not others.
At Yahoo Finance (finance.yahoo.com), you can click on the Profile of a company and see where they’re based out of. However, if you’re with the right broker, you really don’t have to worry about any of that.