I know that the Repticon near me always has a few vendors selling racks, and quite a few vendors selling balls. I would check the vendor list (it should be on the Repticon website), and research some of the vendors for both racks and ball pythons. I would definitely try to research the breeders who are going to be there before purchasing from them, if possible. There are usually a LOT of vendors selling ball pythons, though not all of them will have the "best quality" balls. Good luck!