Newegg offers the Canon EF 24mm f/2.8 Wide Angle Lens, model no. 5345B002, for $549. Coupon code "0328F4DSMS09" drops it to $449. With free shipping, that's the lowest total price we could find by $100. It features image stabilization, 84° viewing angle, autofocus, coated lenses, rear focusing system, and minimum focusing distance of 7.87".