So here is a list of some cool PS2 games, and they can be found at lower prices:

Gran Turismo 4

Tourist Trophy

Final Fantasy X

GTA San Andreas

Pro Evolution Soccer 6

Dragon Ball Z Budokai Tenkaichi

Soulcalibur 3

WRC 4

Smackdown VS RAW 2006

Tekken 5

This is only my opinion of course, but these games ca give you great gaming moments.