I just got a quote from Anvil for my Elrick Jazz Bass. The case is so freakin expensive!!!! Well I guess I'll even it out with the baggage handlers. Forget about putting "Fragile" or "Do not Throw" labels, these cases are build like a tank. Will probably survive a lifetime or two.
Look around for other brands. If I can remember, maybe R&R Cases, Elephant Cases, etc. Look locally for a custom manufacturer - you might find someone willing to do it cheaper. OR, if you're handy, build one. I've built a couple in my day. It's not too hard if you can get the tongue-in-groove aluminum edging and the hardware.
Just get a used Anvil-like case for ANY bass, then modify the internal foam to fit yours. I did this and made one designed for a Rickenbacker fit my Stingray 5 string, picked up off Ebay for around $100. The felt is pretty easy to peel back. Put your bass in, then trace around it with a pen or marker. Remove the bass, then cut the foam with a sharp pen-knife. If there are any spots that are "open" from the previous bass that your current bass doesn't fit into, you can glue in chunks of the foam you removed elsewhere. When your bass fits perfectly, you can reapply the soft felt using aeresol glue.