an ebay seller you guys might like

[AppleQueso]

http://stores.ebay.com/SQUARE-DEAL-RECORDINGS-AND-SUPPLIES/Video-Games-Related-/_i.html?rt=nc&_fsub=12&_sid=12061562&_trksid=p4634.c0.m14.l1513&_pgn=1

Just check out what these guys have. Green official Xbox 360 cases, clear ps3 cases, PSP UMD cases, 2-Disc Gamecube cases (), DS cases,  and tons of them too. Prices are pretty reasonable (DS cases are pretty much on par with nintendo's pricing) and they ship internationally. Lots of DVD cases in various colors too if you want to color-code your disc-based custom cased games.

Just figured you guys might find it useful.

[Snowcone]

Nintendo used to sell 2 disc GC cases on the online store. IIRC they may have even sold 4 disc versions at one point.

[UncleBob]

Sadly, Nintendo hasn't had the 2 Disc cases for quite a while now.

4 Disc cases?  I think you're crazy, sir.  I've never seen one - and I'd love to have a handful.

[BadChad]

Is there even a gamecube game that is 4 disks long?

[satoshi_matrix]

I really don't think there was. The ones that were two were rare to begin with.