You can open an account at IB and only pay 1 penny a share ($1 min) for each of most of the trades you are likely to do. That's about $1 in and $1 out = 2 bucks total. Compare that to $15 in and $15 out, $30 total. Ouch! At least with small size (say 100 shs) and deep discount rates (say $2 in...