Database of legal sites that allow the download of Anime Soundtracks? I am looking for a list of sites that are legal of course where I can buy and download digital copy for personal use of Anime soundtracks. One that would be good is a legal site where I can actually filter through many different anime soundtracks quickly.

Example: I am currently looking for the Uta no Prince Sama soundtrack to download/buy but I cannot find any legal sites to actually buy it from [and I don't really like the idea of pirating or just getting it for free]. I prefer to buy.

Are there any legals sites where I can purchase the soundtracks of different animes?
There's a Japanese website, CDJapan, from where you can order CDs. However, here's the catch: they focus more on offbeat and non-mainstream-anime related things.

For some miscellaneous and also filterable (like in English, Bestsellers, Great Deals, New Releases), I recommend YESASIA. I'm giving you the link that points to its English anime page.

PLAY-ASIA is epic. Trust me. It is. I buy things from there as it accepts my currency too (INR). Here you can find exclusive and good amount of foundational soundtracks. If you feel adventurous, there's more! Like Frozen's Japanese (or was that Korean) version and K-pop songs, etc. But that's not what you asked for, so sorry.

If you can read Japanese, HMV Online is a Japanese website that gives good deals but may be limited in offers and variety of payment.

If you're a resident of Japan, check the comment by another user. Also, it may be that the above mentioned HMV only lets Japanese people buy.

If you're American, you should know about Right Stuf Anime and The Anime Corner Store.

Finally, I recommended you try the mighty Jungle. The prices can sometimes be very well placed.

I've picked the links that will land you at appropriate places. Most websites will accept PayPal too.