question about radio(2000 taurus)

hey guys whats up,,,,a friend of mine has a 2000 taurus and he was asking if i knew where he could find a cd changer for his stock radio ,,he said he got one from goodguys but it only allows him to use the volume button and thats it,,he wanted one where he could use the rest of his buttons like treble and bass,,maybe a stock cd changer or one like it,,,do any of you guys know where he could find one besides the dealer