KBB Book Value for one in good condition = $13,500.00.
I've seen some FD's go as low as $9000 w/ 70,000+ miles on them.
Word of warning though, the apex seals on these cars like to go out around 70,000 miles. They are almost a timebomb at that point.
They are nice car though. If you can find one that has a new motor, or one with less miles on it, you'd have yourself one of the best handling cars in the world.