You can find this complete pack at several retailers, with new and pre-owned options available: Castle S3 - Amazon.com
is a 5-disc DVD collection released on September 20, 2011. This "complete pack" includes all 24 episodes of the third season, following the investigations of mystery novelist Richard Castle (Nathan Fillion) and NYPD Detective Kate Beckett (Stana Katic). Product Features and Content
: "To Love And Die In L.A." featurette and "Interrogation Room" cast and crew interviews.
: Includes bloopers, outtakes, deleted scenes, and audio commentaries.
: Widescreen (1.78:1 aspect ratio) with Dolby Digital 5.1 Surround Sound. Subtitles : Options for English SDH, French, and Spanish. Purchasing Options
: 24 episodes, including "A Deadly Affair" and the "Knockout" season finale.