The 12th season of "Agatha Christie's Poirot" is available for streaming on Amazon instant video, with all four episodes available for $9.99 each. The season is also available on Netflix with a paid subscription, and it is available on Blu-ray and DVD.
The home video rights to "Agatha Christie's Poirot" are owned by ITV Studios Home Entertainment, which has released the 12th season of the show on a number of separate DVD releases, as of Dec. 12, 2015. Some of these include "The Movie Collection – Set 5," "The Final Cases Collection" and "Murder on the Orient Express." The final release, "Complete Cases Collection," contains the entire 13-season run of the show.