I know, I got some books on ebay, too
however, those small ones (DVD-case-sized ~40 pages) are usually ridiculously expensive especially when you have to have them shipped from the US to Europe
sometimes it's ironically enough cheaper to buy the CE and then sell it minus the artbook ... also preordering it often gives you a bonus you can sell alongside the game and the rest of the CE ... no guarantees that it always works however