Roku shares crater over 19% after analyst predicts the cost of streaming devices is going to 'zero'

After running up over 330% this year, Roku shares have cooled in September. However, even after this week’s drop, the stock is up nearly 690% from its IPO price of $14 a share. The stock has been one of the most volatile among technology companies this month as the battle in digital streaming continues. - Michael Sheetz, CNBC [via/web:http://streaming-tv.us]