I wouldn't say hard to find but this is an AMAZING game. Voice acting is bad and has some... Awkward moments but it is still a very good game. I hate Capcom for not making a 4th.
It may be rare or may not I'm not really sure. I just know its easier to find then the first and second clock tower. When I bought this game it was just before GameStop stopped selling ps2 games. They had two copies.