That particular listing is not rare, although a single-sided head cleaning kit is. It's the second or third relisting for that same exact item. I original spotted that seller's photos in a previous listing a couple months ago (which was my opening post in this thread). Dan clearly put it "on sale" because he was unable to sell it previously. He's probably looking at this thread right now, hoping one of us will buy it.

It might be neat to have for sentimental value and to prove to others that there was such a thing as a single-sided cleaning diskette. But I doubt I would get much use out of it, hence my own unwillingness to bid. If one of you wants it, go for it. You may want to use another, newer cleaning fluid though. The cleaning pads are probably still okay after all these years, but I don't know if I would trust that ancient fluid on my heads.