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10/26/2009 · You can invest in the U.S. dollar by putting money in a U.S. money market, by holding cash, or by putting money in a bank. If you want to do this thru Ameritrade, simply do nothing when you send funds, and they will stay in U.S. cash. 9/13/2009 · Fidelity has the best research if that is something that you need. Their prices are a little higher than the competition. E-trade is not the most healthy company around. Scottrade is the least expensive of the major on line brokers. TD Ameritrade offers some research and reasonable prices.