http://www.jp.square-enix.com/ff9/en/ Actual price is $20.99. But there is 20% discount now, so it's $16.99 til 21FEB.
From steam forum, look like this is a good port. (The ports before from SE are crap.)
For anyone's interest. I will buy the pc/steam version. Since I'm interested in mods. The graphic improvement mods for FF7 and FF8 are great.