The master’s degree business is booming. College graduates looking for a leg up in the job market are flocking to one- and two-year programs that promise entry to lucrative careers. Top colleges are more than willing to provide them — for a price. Tuition for a 30-credit master’s in computer science from the University of Southern California runs $57,000. Syracuse, Johns Hopkins and Carnegie Mellon charge over $43,000 for the same degree.