I recently just got The Misadventures of Tron Bonne, it's definitey gettable, and I hear it's much rarer in the US than here, but I definitely spent a questionable amount on it. Mega Man legends 2 seems to be quite hard to get now also.
I was coming here to post that. I bought it for $80 on Amazon (USA) a few years ago (complete with case and manual), but it seems to have gone up to around $140 for just the disk.A friend of mine picked it up for $8 when we were kids. I'm not sure he realizes how much it's worth nowadays.
It's a shame that so few people will have a chance to play one of the best Playstation games out there.