ebay (via bestpriceoptics) has the Rokinon 8mm f/3.5 fisheye lens for $189.99 (reg. $229) in limited quantity. The lens is available for Canon, Nikon Sony A, Sony E, Pentax and Olympus mounts. Check it out here on ebay.
B&H has the Rokinon 8mm f/3.5 fisheye lens in Canon mount for $239 (reg. $329). The deal includes 4% rewards and free shipping. Check it out here at B&H Photo.