Scottrade is $7 per trade. IB says $0.005 per share in the US. So does that mean Scottrade is cheaper once I start trading over 1,400 shares at a time? If I buy ETFs in 200 share lots, that would only cost me one dollar with IB? I am wondering what I am missing because Scottrade is not included on IB's "broker comparison" chart: But then I don't get it cuz it says 100 shares is $0.27: And on their "rates" page it says the minimum per order is $1.00. Can someone clear this up? I want the cheapest commissions possible. I pretty much only trade index ETFs (and their weighted counterparts). I'm currently with Scottrade but I'll change if I can get significantly cheaper commissions.