After a bunch of searching I've found these cases -
http://southtown-homebrew.com/index.php?cPath=170
The Cover Project doesn't have covers for them but the above company does sell them -
http://southtown-homebrew.com/index.php?cPath=1
So it's about $8.00 for the case and $3.00 for the cover art, while much more than it's actually worth that's what I'll end up doing. I know I'll only have a limited number of AES carts since they didn't make a ton to begin with so the extra cost isn't out control.
Edit: Just realized they allow you to download the cover art and print it yourself. Excellent, I'll be able to save a few bucks.