If you LOVE David Bowie, this is a MUST HAVE for your collection; an unreleased demo from 1966 of Bowie singing a song called "I Do Believe I Love You." The rare "45" is expected to fetch somewhere between $3.800 and $6,400 at auction Friday morning.  Too much for you?  Well, they also have signed vinyl copy of Bowie's 1970 album "The Man Who Sold The World," which probably wouldn't set you back no more than... say... $1,900.  Three previously unreleased 1968 singles from Elton John will also be available.  There is one catch though.  The auction starts at 10AM in the U.K. Friday.  That's 2AM our time!  Here's a little taste of what that David Bowie demo sounds like...