Amazon has a smoking deal right now on a 6.5mm f/3.5 wide-angle lens from Opteka. This wide-angle lens lets you capture almost 180 degrees of image into your frame! This is sometimes also called the “fisheye” effect.
You can get this cool lens for Nikon, Canon, or Sony mounts. All three on priced the same, on sale for $150 from Amazon with free shipping.
Note that this is a manual focus lens. Time to get your camera skills on!