Graceful chameleons were commonly imported...they used to be the most common one seen in petshops. BUT, they almost always wc, usually very parasitized, dehydrated, and not in great shape. I don't know if anyone is captive breeding them (they were very inexpensive to import so no one had much incentive to breed). They are pretty little chams, but I have hardly ever seen one in good shape. If you do buy one here's some things to consider.
Buy one ONLY from a cham specialist who has had the cham in their care for several months.
Be ready to have it treated for parasites several times by a competent herp vet.
Don't buy a tiny hatchling or a full adult. Try to get a juvenile about 4 months old. Fewer parasites and easier to feed and acclimate.
If the cham you are looking at is black spotted constantly it is extremely stressed. A calm on will show no spots.
There are species profiles on these sites that will help you set up the right habitat:
http://www.adcham.com
http://www.geocities.com/ccicenter
http://www.chameleonjournals.com
And these have good overall cham care info:
http://www.calumma.com
http://www.chameleonnews.com
Good luck!