I found this online... The case is actually a bit taller than a standard SCD/SAT case (just under 10 inches tall) but it might be what you are looking for.
Unfortunately the only site I see that sells them has a order minimum of 20,000 units.

What would those be called? Of course I wont want 2000 of them, but knowing what Im looking for would help the search. Having 4 spots for disks seems pretty awesome too, what was Sega thinking making people keep multidisk games in a stack of paper sleeves?
Either way, Beastman gave me an idea. Theres a store near me that I remember had a bunch of copies of Prize Fighter. Unfortunately, he isnt known for his low prices. I should check it out either way.