Show me important gaming moments of your childhood...
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http://www.gamespot.com/gba/rpg/finalfantasyviadvance/index.html Gameboy Advance. So you'd probably have to find it used.
Damn, OK. I found a few amazon sellers who still carry the thing, so I might order from them. I'm ashamed that I never finished it - got about 3/4 of the way through the World of Ruin, then life intervened.

If today is a bad day for this, I may save it for Tuesday when everyone is back at work. :)