It's got to be Metal Gear Solid: Special Missions I suppose. Well, it's not that rare in the end... But it's definitely not too common either.
I agree with Son1x about ICO here. I got it a year or so ago and it was pretty cheap. There were other people selling it, too. Did I mention my copy was apparently a re-release or something as well? It even had a Shadow of the Colossus ad on the back of its manual.







