$1 Stock Commission - Interactive Broker

Millionaires know a good deal. Here is my recommendation to you future millionaires/billionaires - Interactive Broker. I have been using them since March this year. It is definitely cheap, but you've got to learn and understand what you are doing. The online interface is very basic, i.e. not very user friendly. This site has a direct link to the stock market. There is no human involved in executing your trade. Absolutely efficient!

Check out their fee chart

Warning: For those of you who need lots of stock support & advice, Interactive Brokers will not give you that.