OFFICIAL OUTLETS

DVDs

• French
  La Nuit au Musée 1 & 2
  Includes: NatM, BotS
  Versions: French, English
  La Nuit au Musée : L'intégrale des 3 Films
  Includes: NatM, BotS, SotT
  Versions: French, English
• Japanese
  ナイト ミュージアム DVDコレクション(3枚組)
  Translation: "Night at the Museum DVD Collection (3 discs)"
  Includes: NatM, BotS, SotT
  Versions: Japanese, English
  Night At The Museum: Battle Of The Smithsonian Special Edition
  Note: This version was a first press/first edition, released 16 December 2009. It is sold out.
  Includes: BotS
  Versions: Japanese, English
  ナイト ミュージアム ブルーレイコレクション(3枚組) [Blu-ray]
  Translation: "Night at the Museum Blu-ray Collection (3-disc set) [Blu-ray]"
  Includes: NatM, BotS, SotT
  Versions: Japanese, English

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STREAMING

All four films are able to be streamed through Disney+. Sometimes on US Disney+, BotS is unavailable to stream, for unknown reasons.*
Currently available (LAT): English, Spanish, French, German, Finnish, Italian, Japanese
KRA Dubs: English, LATAM Spanish, CAS Spanish, French, German, Brazilian Portuguese, Portuguese, Dutch, Swedish, Finnish, Norwegian, Danish, Italian, Turkish, Greek, Hungarian, Polish, Russian, Ukranian, Romanian, Slovene, Japanese, Chinese, Mandarin, Cantonese, Korean
For more information on the differences between the dubs, check out the Translations page!
*Admin: I suspect it's for copyright reasons, but Disney owns the series in its entirety. I genuinely don't know why it keeps disappearing, because Disney owns everything in the movie, from the characters to the cameos from Oscar and Vader.

The live-action trilogy is also available on Amazon Prime in the following languages: Japanese