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Aubrey Hodges, creator of the soundtracks for the Nintendo 64 ports of Quake and Quake II, has recently released both of them on his website. All tracks including some bonus songs can be listened to online or purchased for $10 in various audio formats.
Quake - Nintendo 64: Official Soundtrack
Quake 2 - Nintendo 64: Official Soundtrack
There are several more soundtracks available on the site, such as Doom 64 and Playstation.
Changed the title to make clear they are not free. Bleh.