16x9x1 inches? That's bloody enormous! If you wanted a 7" - 12" cse then I'd point you in the direction of the wholesale Android tablets from China which can be had for < $100. But 16x9?
For that sort of size I can only recommend getting an old laptop, although if you want your aspect ratio then you'll need a widescreen. If you can find an old broken one then just rip the top (screen) half off and you've got a nice basis for a tablet. Plus, if the screen's still intact then you've got a working display as well (so long as you can interface with it).
hope this helps