I can't believe no one's mentioned
Johnson Bible College. The TOTAL cost is
$10,000 (approx.) a year. They have a rather large endowment which allows for low costs for the students (and they have the nicest dorms I've ever been in... central heat/air in every room and private bathrooms in every room.
Conversely, my college,
Franklin College of Indiana costs about $26,000 a year and is only loosely affiliated with the Baptist church. (VERY loosely...)