It is 250€ on the official french pocketbook webstore but currently out of stock :/. As rkomar said, apparently, in library mode you can't see the cbz covers but in browsing mode, you can. I've tested myself a cbz on a kobo touch (6 inches screen) and it is quite readable, so with the 9.7 inches screen of the PB 912, I am not afraid at all
. I don't plan to read mangas scanned in double-page by amateurs but official releases such as scantrad.fr etc, so I can't help you on that. It seems that, thanks to the sdk, you can emulate the pocketbook but I didn't tried yet