According to Diamond the top selling Graphic Novels for the month of October were 1. BATMAN HC VOL 03 DEATH OF THE FAMILY (N52), 2. AVENGERS ENDLESS WARTIME OGN HC, 3. JOKER DEATH OF THE FAMILY HC (N52) 4. BATMAN COURT OF OWLS BOOK & MASK SET (N52) 5. AVATAR LAST AIRBENDER TP VOL 06 SEARCH PART 3.
Batman HC Vol 03 Death Of The Family is the collection of the ark of the return of the Joker and his attempt to to attack the Batman’s psyche and destroy his relationship with his family. Written by Scott Snyder and art by Greg Capullo. In all DC has 3 in the top 5. You can find a whole list of 100 top sellers at Diamond Comics.
Source: Diamond Comic