siemshop on ebay has the pdair leather book model at one time there may have been other manufacturers...can't remember rightly if I've seen any others.... there are plenty of leather flip models ...belt style leather pouch models and all sorts of plastic or silly-con ...but for a while now only pdair seems to make any book styles for the n900 (they are the only ones making the aluminum n900 cases as well)...almost as rare as the elusive n900 otter case