For the month of December, Roku channel developer Flickstream is offering two of their channels at no charge. Drive-In Classics streams classic sci-fi and horror films and is currently featuring titles such as Attack of the Puppet People 3D (1958), It's Alive (1974), and Encounter with the Unknown (1973).
Both channels have many more movies beyond those featured here, all for free through the end of the month. If you want more after that, these channels are only $3.00 each per year. For more information each channel, click on the following links: Drive-In Classics | Moonlight Movies