THQ officially "dropped" the PlayStation 2 and PSP versions with the release of WWE '12 to focus on its new "Predator Technology" engine.
Your nostalgia is valid, but your hardware choice isn't. Fire up PCSX2 with SvR 2011 or install RPCS3 for the real deal. Either way, you’ll be suplexing your friends long before you ever find that fake PS2 ROM.