I guess it's not terribly rare anymore if it's on iTunes, but it was rare!
Via IMWAN, we learn that the quasi bootleg Cocaine Drain album is available for download. This is a collection of outtakes and demos from the musical clan that formed the real-life template for the Partridge Family and recorded some excellent sunshine pop back in the late 1960s.
IMWAN posters warn, however, that the sound quality for these tracks is pretty crummy.
You can check for yourself here.