I bought 2,000 more shares on using thinkorswim. I just wanted to make sure I didn't have any limitations with buying penny stocks with TDA. Can't win em all I suppose. DNDT didn't move like I thought it would and I realized I misunderstood the transaction costs still. I thought TDA would be cheaper due to the size of the position but I didn't realize on IB, that if the size is large but the stock is cheap, then there is a .5% ceiling on a trade. Good learning experience.