It's hard to believe that you can't find any CB Jacksons. Personally, I would not purchase a WC unless I was ready to challenge the internal parasites and stress. They also take an extremely long time to acclimate. WC's are okay if you want to add new bloodlines to your breeders, but that's about it. Now, I'm not really knocking them, but there is just so much involved in getting them straightened out. You can't always rely on the seller giving you accurate info on their history, 'cause they want your money.
Try checking the classified forum on chameleons. There are lots of reputable breeders out there that would better to suit your needs, and answer any questions you may have with direct, honest answers. WC's are often dehydrated & full of parasites. If you decide on a WC, I'd have it checked by a vet ASAP.
Hope this helps,
Cricket