BuyDig offers the Rokinon 16mm f/2.0 Ultra-Wide-Angle Lens for Canon, model no. 16M-C, for $379. Add it to your cart and it falls to $349. With free shipping, that's a buck under last week's mention and the lowest total price we could find by $30. This aspherical lens features a removable lens hood.
It's also available for Nikon AE for an in-cart price of $359 with free shipping. That's $21 under last week's mention and the lowest total price we could find by $65.