
That price gets you the 7-incher, which has a resolution of 800 x 480. The 9-inch models ($US160 with detachable webcam; $US140 without) can do 1024 by 600. Each uses USB for both video and power — you don’t need any fancy graphics card.
What sells me on them, though: they’ll also pivot between landscape and portrait orientations. Nice. [DoubleSight]