FAQ

Yes, all six of the Netflix Marvel series (Daredevil, Jessica Jones, Luke Cage, Iron Fist, The Defenders, The Punisher) are part of the Marvel Cinematic Universe (MCU). All series were produced with the intention of being part of the MCU with this show making references to "The Incident", meaning the battle from The Avengers, as well as the superheroes Captain America, Iron Man, Thor, and Hulk.

There was concern that the Netflix series were not part of the MCU, as they were made under ABC Studios while Marvel Studios handled the MCU films. Many fans noted how other MCU shows, like Agents of S.H.I.E.L.D., and the films made no references to the events in the Netflix shows. It wasn't until Spider-Man: No Way Home included Matt Murdock, again played by Charlie Cox, that anything from the Netflix series of shows was definitively included in the MCU. Matt Murdock/Daredevil would then be included in the MCU series She-Hulk: Attorney at Law and get his own show Daredevil: Born Again while Kingpin would be included in the shows Hawkeye and Echo. While there has yet to be any specific mention of Jones, Cage, Rand, or Castle in MCU films or current series, the inclusion of two Netflix actors reprising their roles is good enough reason to presume all six shows are canon.

Unfortunately, if you didn't buy the blurays at initial release, you'll likely be paying a hefty price to track them down. Amazon should have them in some capacity. Likely an import.