Just do lots of research and buy the morph that you like (World of Ball Python Morphs have a TON of pictures you can look through). Check out everything available on Kingsnake Classifieds and Fauna Classifieds and see how much things are going for. Not sure what you consider expensive or not but regardless of what you decide to get always check the seller on Fauna's Board of Inquiry to avoid shady sellers and practice quarantine with your new BP. Good luck!