EasyCover has a new product: Lens Oaks cover for the Nikon AF-S Nikkor 200-500mm f/5.6E ED VR lens (now $140 off) that provides protection against scratches and bumping (the lens remains fully functional). Ebay and Amazon currently have them in stock (EasyCover products are also sold at Adorama and B&H). The cover is made of neoprene material: soft from the inside and water resistant on the outside and is available in 4 different colors:
