You are referring to the KB5181, I suppose?
Those are GREAT switches but lame keyboards. The construction is mediocre at best and the layout is odd with a big-ass "Enter" key. That does not bother me very much, but the single-width "Backspace" is a deal-killer for me because, apparently, I usually hit it on the front (wrong) side.
I have owned 3-4 and sold all but one on ebay. The ones I sold were in decent used condition and I think I got $20-30 for them (cleaned up, some amount of work in itself) after having them listed for periods of more than a week.
I have not sold one in a while, but the rational thing to do is go to ebay and view the current listings, and completed listings. Ignore high "Buy-It-Now" prices unless there are completed sales to back them up.
My advice: clean it up as well as you can, test it, list it with a good accurate description at about $35-40 BIN, and drop the price by $5 per week until it sells.
