Good luck finding Ico under 100$. If you have a PS3, wait for the rerelease.
But OT:
The Jak series, especially Jak II.
The Ratchet & Clank series, especially Up your Arsenal
Final Fantasy X and XII if you're into JRPGs
God of War I and II
Devil May Cry 1 and 3 - pick the SE for 3 unless you're masochistic
Okami, unless you have a Wii
Soul Reaver 2, but only if you played the first one
The Sly series, especially Sly 2
Onimusha Dawn of Dreams (Onimusha 3 is good too, but DoD is the best)
That's all I can think of for exclusives. I hear Persona 3 and 4 are great, but I've never played them. I've been meaning to plug the PS2 back in and try them out.
