Small Stocks

What is the best place (broker) to trade stocks with small capitalization?
I can change and even penny stocks and information on reservations that the purchase and sale price (that I know all the agents buy / sell Units in blocks of 5000 for max before adding a new brokerage. Does not the limit of most populations of less than 50 cents (due to cost brokeage) which could be negotiated days.
You may want to check out the online discount brokerage. Scottrade has a history. I'm not sure what they charge for penny stocks ", but my operations in major exchanges are only $ 7.
Trading Small Cap Stock Online Live April 15