I saw a few systems on ebay. A common issue seems
to be bubbling in the monitor and faulty light
pens/CPU cards. Also 'several thousand dollars'
does seem a bit on the high side for a basic
8 bit rack in questionable state, although the
keyboards are nice :)
There are also the Fairlight QDC or MXP racks, which
seem a later system (some kind of digital recording/
mixing desk). Those are not too interesting to me,
8 bit digital playback is so much more fun.
Ian.