In a holiday announcement, Barnes & Noble is putting on sale 500,000 signed books from more than 100 top authors on Black Friday, “while supplies last,” hoping to draw store traffic. The bookseller says it has been working with authors and publishers for more than 7 months on the initiative. “We found that the authors were just as keen as we were to deliver on this idea because they saw how meaningful it would be to their fans and readers to have these as gifts to be remembered long after the holidays are over,” vp, adult trade & children’s books Mary Amicucci says.