For pure sound effects, Toxic Bag productions puts out some pretty decent CDs. I would recommend the reddish colored CD...it's like all background ambiance and such. Volume II monsters is the one that I have...it's ok, but not as good as the other one. Although there are a few AWESOME tracks of undead noises--especially the ghosts and phantoms--they're wonderful and ALWAYS manage to get my players onto the edges of their seats.