I personally recommend Garrick DeMeyer from Royal Constrictor Designs.
He answered all my questions in a timely and informative manner and was just really easy to deal with and the girl I got from his has never refused a single meal to date. His prices are pretty fair, to me anyway, because he takes such great care of his snakes. I don't know if he has a BEL available but you could check his website and if not just e-mail him and he'll get back to you pretty quick.