I have a B.C. Rich Avenge SOB. I want to get a guitar case for it. But which one is big enough for my guitar to fit in? and also which one is cheap? Thx for your time...
im guessing bc rich would have them. cos those guitars are weird shaped.

or maybe make one?
You're best bet would probably be a Coffin Case. Don't know how they read on the "cheap" meter for you, but that's the only thing that comes to mind that could possibly fit that guitar, other than a custom fit case.
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There are BC Rich Hardshell cases, well I only found one online which I think should fit all types of bc richs.

I'm not completely sure though, you may have to ask the company or something.