HBO and Cinemax have just arrived as the latest new Amazon Channels. This marks the first time Cinemax content is being made available on the Fire TV. The HBO subscription will run you $14.99 per month, while Cinemax will cost $9.99 per month. Both subscriptions come with a 30-day free trial. The main advantage to subscribing through Amazon Channels, versus subscribing directly and using an app like HBO Now, is having all content natively available within the Fire TV interface and streamed directly by Amazon. Another perk is the incredibly simple 3-step online cancellation process, which makes managing subscriptions on a month-by-month basis easy, as well as having everything on a single bill. Amazon Channels have grown to over 80 different video subscriptions since the feature launched a year ago.