Sadly there isn’t much choice... its Ketron or Ketron..
Um, there's also the BK-7m which is cheaper, much more readily available, and probably has a better system for simplified chord fingering (if you're into that sort of thing.)
Well, yes it is for sale..
Roland is still selling out old stock..
And its indeed still quite popular..
Its about the same size as the SD40 from ketron..