Can I obtain a Library Science degree without first having a bachelors? ?

I want to go to school to become a librarian but I don't live close to any schools that offer that program. All the online schools I've checked out tell me I must first have a bachelors. Does anyone know of an online school that will let me attend without first having a bachelors? Or am I s.o.l.? Or if anyone can tell me of a school close to Iowa that isn't terribly expensive.