BuyDig offers the Rokinon 16mm f/2.0 Wide Angle Lens for Canon, model no. 16M-C, for $479. Coupon code "APS-C16" cuts it to $379. With free shipping, that's the lowest total price we could find by $100. This aspherical lens features a removable lens hood.

Also available is the Rokinon 16mm f/2.0 Wide Angle Lens for Nikon, model no. 16MAF-N, for $489 before the above coupon, $389 after. With free shipping, that's the lowest total price we could find by $90. This aspherical lens features a removable lens hood.