There's a new box set going on sale Tuesday on amazon.com with Jan & Dean's Fan Tan on it.  I played the 30-second preview clip and it sure sounds like it's from the master tapes. 

 

The set is called Where The Action Is! Los Angeles Nuggets 1965-1968 and it's from Rhino.  It's about $40 and otherwise has mostly non-hits.  Now, if Rhino would only license the whole Carnival of Sound album...