Tos charges $1.50-$2.95 per option. IB charges $.75 per option. IB charges a cancellation fee of $1.20 unless you get some number more fills than cancels.
That being said, cancellation fees stink, but it's not IB that's charging them, it's BOX, PHLX, AMEX, CBOE, and the rest. IB is largely...