I can't answer these specifically (I only own BCI) but I would agree with the poster above... rare bloodlines or great color / pattern. I would not buy a BCC from a reseller like backwater.. I would go with a private breeder and ask to see pics of the parents and siblings as well. Price will vary somewhat within a litter too depending on color / pattern.
I post on another boa-specific forum. I know there are several Bcc breeders on that site, so you might want to try posting your question there. I've always gotten good advice there, but it tends to have less traffic than this forum.
EDIT: Here's a link to a thread by one of the BCC breeders on that forum showing her "holdbacks" you can get a good idea of quality by looking at them. I'm sure she would gladly tell you how much she sells babies for it you private message her.
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