however, oojason should be more specific as to what 3/4 disc case he wants them for (especially since your being so nice and incorporating everyones suggestions). I say this mainly because you can get multi-disc cases that vary in sizes. ie 2 disc cases that are the same size as single disc cases or a 2 disc case that has the spine with of 2 'normal' cases. Ive even seen 2 disc cases that are the size of slim cases.
-Darth Simon