Newegg.ca has a good deal on a Targus Black A7 Notebook Case, 16". On sale for $12.99 with free shipping you save $22 off the original price of $34.99.
This case is designed to protect up to 16" widescreen laptops and made out of neoprene and industry-grade tarpaulin material which are water-resistant.
Limit of 5 per customer.
Its a good case for any 15" laptop. Its thicker than the really thin ones and should provide more protection which is what I wanted. My Dell XPS 15z fits in very easily (which I expected since its very thin), but my wife's Dell 15R also fits in almost as well.