In general, I have no interest in these materials, so I do not go much out of my way to find them. There are, however, some movie files in my web site (check the updates page for the latest information).
Yes, if it's from the Japanese Sailormoon CDs. However, I have very little experience with the musicals, so I'm less likely to succeed if you ask for something from the musicals.
If you ask me to find something, you must give me as many details as you can about the music you're looking for. The most useful information to include is when the BGM occurs in the series. The second-most useful information is an audio excerpt. An ideal request is something like:
Hi! I'm looking for the BGM that plays when Haruka is driving Usagi to Tokyo tower in episode 102 of Sailormoon S. It begins at 02:30 in the episode and continues playing until 05:24. I've attached a short audio excerpt of it to the end of this e-mail.
As time ticks away the CDs are getting harder and harder to find. The reason is that Japanese companies eventually stop manufacturing a CD, no matter how popular the CD was.
A local anime store is always a good place to look for Sailormoon CDs. For information on anime stores near you, try the Anime Web Turnpike Shopping Guides.
If you prefer to shop online, the best online shopping guide I know of is http://sailormusic.net/info/shopping.html.