Unfortunately, they seem quite difficult to keep...
We tried a few back in the '90s when we had Glades Herp. The imported ones sometimes came in looking really good, and we cherry picked the best ones. We even got a few juveniles. They looked great, ate well, seemed healthy, and within a month to a few months, started going downhill for no apparent reason, and died. I heard that the Asian snake markets sometimes remove some organs that may be needed, but have no idea if that is true. We were never able to keep any long term, though.
I bet if you could find some c.b., you might have better luck. But Mark Bell got a few (probably w.c.) quite a few years ago, and had very poor luck reproducing them, even when he had a few that were eating and doing well. That info is a few years old, so he may be doing better now. But I doubt that many, if any, breeders are regularly producing them in any numbers. So I would expect c.b. babies to be very expensive, if available at all.
I would suggest that they are probably not a good beginner snake. And I would suggest not buying any w.c. specimens. If you can find a c.b. directly from the breeder, and you trust the breeder to give good info (that might be MUCH more updated than my older info), that would be the only way to obtain them, in my opinion.
Sure would like to see them bred regularly - they are very impressive!