I've found the motion picture score for the first movie online through my lackluster googling skills, but I've yet to find the scores for the second and third movies in lossless.

Here's some info on them:
Rurouni Kenshin Kyoto Taika Hen Original Soundtrack
『るろうに剣心 京都大火編』オリジナル・サウンドトラック (http://vgmdb.net/album/46226)
Rurouni Kenshin The Legend Ends Original Soundtrack
るろうに剣心 伝説の最期編 オリジナル・サウンドトラック (http://vgmdb.net/album/48081)

I tried doing a quick search in the forums, but only found mp3s with vbr. I've also tried looking on a P2P Japanese application without any luck.
Does anybody have or know where these might be?