I found one on the side of the street by my old office. Someone just threw it on the side of the road because the gdrom motor was faulty.
My favorite games for the DC are Mr. Driller, Grandia, Ikaruga, Mars Matrix, Skies of Arcadia and Legacy of Kain.
Such a great little machine, and with a bit of hacking, it can work as a linux web server.
Ikaruga is one of my all times favourites. Unfortunately I couldn't source it for the DC, so I had to settle for the GameCube version. Good times.
I think that my friend and fellow gdgt user rawhewnstone is the king of servicing supposedly non user serviceable stuff. The man is a tinkerer and creator of the kind that I hope to be someday.