FREE HBO, Showtime, Starz, Cinemax & CBS 7-Day Trials (Amazon Prime)
Make sure you have an Amazon Prime account first.
Pick any channels you want to start trials for here:
Start your Showtime trial here.
Start your Starz trial here.
Start your Cinemax trial here.
Start your CBS All Access trial here.
Start your HBO trial here.
You can manage your subscriptions under your account then look for “Manage Your Prime Video Channels” (or click here when logged in)