I saw CSN in about 1978 when Stills did "Tree Top Flyer" . I thought it was great and casually looked for it for years. About two years ago, I got serious.
New, sealed on Amazon was $175 (!) and used copies were at least 55-75. It's been released on Still latest release (the name of it escapes me right now) of early, in-the studio-leave-the-tape-rolling mess of his earlier stuff. Historically interesting, horrific sonics. If you want my copy, before I take it to the skeet range, let me know. It's horrible, but it is what it is.
Other than those two releases, I'm not aware of any others. Shame the rerelease is not of the studio version.