DVD Release
Bonus Features
The Making of BIONICLE 2: Legends of Metru Nui
Metru Nui Explorer (Playlist, right click and open in new tab)
Official Soundtrack
The official soundtrack is available from the composer, Nathan Furst, on most major platforms.
Some music from the film trilogy was not included in the official soundtracks. These pieces have been compiled by BioMedia Project into an unofficial album:
BIONICLE Trilogy Unreleased Tracks