GotherL,
It is a little confusing the way you asked. Every time you hit "buy" or "sell", your broker will charge you $0.005/share, but each order require a min commissions of $1. So 100 shares is $1.00. 200 shares is $1. 300 shares is $1.50. Your position size is not relevant, only the order size for each order.
Does that help.
Bob