"Harry Potter" Heads To Paperback

"Harry Potter and the Half-Blood Prince" hits paperback on July 25 with a first printing of 2 million, says Publishers Weekly. That brings the total number of Potter books in print to 120 million. That's 120 million in the US alone, mind you. Presumably some penny pinchers are pleased by the news and of course a paperback is easier to tote around. But since it's priced at $10 and the hardcover can be found easily for $17, is it any surprise sales of paperbacks are floundering? They get more and more expensive every day.