Years ago I spent some time collecting a few unique CD's that I came a cross in my purchases. Here are the one's I can think of.
Body Count: Includes Cop Killer which was pulled off later releases
Green Jello: Had a brief hit with 3 Little Pigs in 1991 but then had to change their names so later releases they were called Green Jelly
White Zombie/Let Them Die Slowly: WZ's first album release. Not as good as their later stuff.
Metallica/Kill'em All (first edition): includes Am I Evil? and Blitzkrieg. Due to legal reasons they had to yank the cover songs so most releases are missing them.
What do you have?