I too have been on this quest. At this point I think I have nearly everything except Cycle of the Werewolf, Dolan's Cadillac and Little Sisters of Eleuria. I am also on the hunt for a Like New HC of the graphic novel N to sit alongside my hardcovers of the Marvel's Dark Tower and the Stand books. I also recently got the bug to replace all my BCEs with true 1st edition HCs. So that has been consuming me lately. Time to start dumping all of my duplicate copies and save up for the Cycle of the Werewolf! LOL