I bought a PS2 at a pawn, but have been having a heck of a time finding cheap games for it. I planned to scoop up a bunch at a GameStop in the area, but they sent them all back to corporate (and who knows what happens to them there, because they're sure not on the web site). With that option no longer available, what's a good source for reasonably priced PS2 titles? Has it reached the point where the system's library has shifted from passe to collectable?