I went to a local flea market today, and spotted a vendor selling PS1 'Wild Arms' and 'Chrono Cross' for $9.00 each, both non-greatest hits. (actually marked $12.00, but I got him to go $9.00 - got both for $18.00)
I checked that both discs were present for Chrono Cross, saw two discs and bought it. Now that I'm home, I see I have disc 2 only, and the other disc is "Legend of Mana." Lesson learned.
All I need to do is track down the other disc for Chrono, and the packaging for Mana. (Probably won't happen, huh?)