Well if you really want to know...
This is the game's CD case. The soundtrack is the 6th disc, so this CD case is probably what you should be looking for.
And limited edtion package looked like this. I've check most texts on the package (from pictures on the internet), there's no indication about whether the limited edition contains the 6th disc i.e. the soundtrack CD, but generally you would assume soundtracks are enclosed in limited editions. Note that Taiwanese companies also bundled soundtracks in games' official guidebooks back then, although I haven't find any information regarding this game tho.
For now, the best I find is a post in 2002.
https://www.ptt.cc/bbs/GAMEMUSIC/M.1...014.A.113.html
"The soundtrack CD has 17 tracks, 9 from Mitsuda, 5 from Chih-Chan Tsai and 3 from Ai Kuo Chia"
There are people selling the limited edition for 999 TWD. You can also buy the game CDs somewhat around 400 TWD, but probably without booklets and whatever credit that may be written in it.