http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=final+fantasy+psx&x=0&y=0
Origins/Anthology/Chronicles too
Every PSX FF game except 7 and Tactics is still available new for about the price they were as soon as they went Greatest Hits. And it's always been that way as long as I can remember. Kind of weird, right? I assume they're not still making these discs.