Used pre IIIC ER cases always show up on evilbay for less than $35, buy one that`s a little worn out and cut the top off, I have two old cases like that with my IIIC`s in them when they are being used and clean like new ER cases when they are in storage
Tom
PS: I might even have a worn out pre IIIC case, I have to take a look, if I do I`ll let you know 🙂