Most vendors at shows will not give you a written guarantee. After all once you walk out the door there is no way of telling what you are going to do with the animal. You may decide to leave it in a hot or cold car while you go out to a movie! (just an example). Not necessarily. Even the best breeder can have a health problem, though those snakes doesn't usually go for sale. Relax and enjoy the show! You will find the snake that is right for you.