I suggest moving your account to Fidelity. OTOW is traded like any other stock you can negotiate the commission. I pay $4.95 a trade regardless of the amount of shares and this is lower than Zecco fees (I use to use Zecco and it cost me over $6.50 trade)
They will also give you 200 free trades when you move your account over and that is a significant amount of money saved in trading costs.
It takes about three days to move your account over and they have a page on their site that is easy to fill in, they do all the work for you in moving your account, including contacting Zecco. And the support and speed of execution for your trades is a 1000 times faster and better than Zecco.