Get a decent broker, shouldn't cost you anything.
Maquarie Prime stops are free and the platform is heaps better then Commsec. It lets you set stops as well as limit orders that trigger when a price is reached, you can also short stocks.
I second that.
SkyQuake: lol @ efail. E*Trade used to mess up my orders on a regular basis, despite me telling them time and time again in their stupid customer service questionnaires.