First of all, What does 80% sure of anything mean? If you are buying from someone who cannot tell you with 100% accuracy what locale you are buying then you should stay away from them. This is done by establishing bloodlines on the breeders part. This can't be done with guess work. Any breeder that doesn't keep accurate records on everything they breed is doing a huge disservice to everyone. Anyone who can't produce lineage records and are charging super cheap prices beware of. I am a breeder that keeps meticulous records of everything that I breed. You can reach me at heroicchameleons.com. Other breeders that I personally recommend are Kammerflage,Screameleons,Prism chameleons,Pams chams,FLA chams.
If I have left out any reputable breeders I am sorry. This is my personal experience. Again, someone who can't answer all your questions with guarantees as to what you are getting, stay away from.