There have been a few in that price range (and less) for sale here in the Bay Area for two months. One dealer has a brand-new one for $3699.
1974 R90/6 w/1050 kit. Motor only. Seeking a frame.
1981 R80G/S Renovation under way. For sale Spring '14
'91 Bill Holland Steel w/Dura Ace
'01 Z3 3.0 Coupe. The Clownshoe.