These often go on eBay Germany without any bids or for 1 EUR. I never thought them to be too special. They use the non standard short-travel ALPS switches, not the regular ones. I actually don't like their feel as they seem to feel rather mushy.
As for making it work on a PC, it might be easier to use another controller to make it work, if you can't find any adapter. I believe I have seen a document of the full matrix somewhere.. either here or on kbdmania.