From a breeder, look on places that advertise reptiles such as reptile forums uk.
Though expect to be quizzed, if you have a female, you can expect a breeder to want to know her current stats, her care regime and the equipment you have and what morph she is if you plan to breed them. Most reptile keepers wont sell their animals if they dont get the answers they want. The decent breeders anyway! Still... a much more uptight hobby that fish keeping thanks to the animal rights people.