Currently I use Prophettrader as my broker, and am very happy with the platform and service. I am looking for a back up brokerage. Fortunately for me, I have been relatively successful trading. I typically trade between 2000 to 10,000 shares, and hopefully more in the future. Therefore, a broker that charges a flat fee is preferable to one that charges per share like IB. I was wondering if anyone knows of a good direct access brokerage that charges a low flat fee for ARCA. I know a few like Prophettrader charge a flat fee for ISLD, which I use part of the time. But I haven't seen the same for ARCA. Any info would be appreciated.