Check sleeves and cases sold for netbooks. A quick look at the one that came with my ASUS EeePC 901 makes me think it would fit your specs. It's too big for my 505 with an M-Edge Executive cover, though -- an inch or so too long.
I've seen some of M-Edge's Kindle covers recommended, and also Case Logic might have something that fits. Book Armor cases fit the standard cover, but I don't think they fit the lighted one -- but maybe they do; it can't hurt to look.
DRM is to rights management like DDT is to pest management.
Filesystems manage files. Calibre manages books. Let calibre do what it's there for, and don't go peeking up its skirt. It'll slap you. ~ ~ (explanation here