[Lady Lamont]

You could always get a SNES emulator with the original Final Fantasy III - a couple of guy's at a local game shop have one of the fan-translated original versions of III which they play with an emulator, if you looked around or found a SNES version of III you could still play it. But overall they never released III onto the PSX, on VI which was misnamed as III due to lack of releases outside of Japan resulted in VI being called III on it's release, VI has been ported to the GameBoy Advance called Final Fantasy VI ADVANCE.

But overall I'd suggest the Nintendo DS remake of III as it's easier to get your hands on in comparison to an original Final Fantasy III.