Japanese Game Boy Advance+Color Protective Cases?

I just bought some brand new Japanese Gameboy advance games and gameboy games and I am trying to find protective cases/boxes to store them in but I can't seem to find any. The game boxes are different sizes than their English counterparts so I can't just buy normal GBA/GB cases because they won't fit. Does anybody know where I can find cases to fit these games? I can provide measurements if they are needed. I am talking about cases to protect the unopened game boxes, not the cartridges themselves.

Thanks!