Meijer's is having a half off sale this week and one of the items was PS1 games in the those big honkin' clamshell packages. $7.50 seems like a good deal.
a few games I can remember seeing:
Blast Radius
Action BAss
VIP
Duke Nukem Time to Kill - GH
Mortal Combat Trilogy - GH
TArzan
MIB the series Crashdown
Gunfighter
Crossroad Crisis
Madden 98
Sammy Sosa Softball
Top Shop
and quite a few others