Like is there an official one yet? If not is there a rip I can download?
IS IT STILL IMPOSSIBLE TO RIP MUSIC FILES STRAIGHT OUT OF THE GAME!?

pretty much. Your best bet is either to do a line-in rip of it, or just wait until 3DS games are cracked.

You're in the wrong section, friendo. To answer your question, you can look here, great quality, doesn't have every track but you have a lot of them still : Luigi's Mansion: Dark Moon - YouTube (http://www.youtube.com/playlist?list=PLz5gUls4mkX8K_maB6fR-YJqqaCPtx44E)