The problem with offering it for sale is that, inevitably, someone with gotta-have-it-compulsive-disorder will end up with it, and, just as you never used them, neither will they.
I am absolutely innocent in this regard.

So, rather than interest those who would naturally be interested, why not share what you enjoy with someone close to you? Family, friends? I haven't quite convinced my dad to let me set him up with an elite, oldskool gaming system, but I do have a brother-in-law that I know would get a kick out of one of the CM-500s I'm not using. I'm sure you know the type - someone who thinks that Monkey Island with the PC beeper is great music.
It's infinitely more rewarding than simply selling something. (Just make sure you get the stuff back if they ever decide the PC needs to go!)