Are there many 1710s still left?

Just one thing i've been wondering for a while...exactly how many AppleVision 1710 or 1710AV displays are left? I know that back when they were new they did have a lot of issues, and I'd imagine that most of them, sadly, would be gone by now. Mine works fine, although it often needs a kick in the head, physically, at times to restore the horizontal deflection.