Blockbuster On Demand is available on Roku, and it can be found on its Channel Store. The channel requires an account from Blockbuster On Demand, and individual movies are rented on a pay-per-view basis.
Although an account is required, Blockbuster On Demand has no subscription plans. You do need a valid credit card to set up your account. Rentals run from $2.99 as of 2015.
The Roku devices are available in four different models: Roku Stick, Roku 1, Roku 2 and Roku 3. The Roku Stick comes as an HDMI dongle that is plugged right to the TV. All Roku models come with a remote control, and prices range from $49.99 to $99.99.