There are a number of Tracked Rapiers around, Dave P on this form has (had?) one which was for sale, and was a good runner. There were some at Jacksons, but they have since been cut up. I agree it does look pretty complete inside, more so than some of the others I've looked in. It's definitley worth saving, but I guess it depends on price!
There is a guy quite local to me who has one he bought fairly recently, I don't have any contact details for him, but he seems to be enjoying it.
Chris