B&H Photo-Video offers the Tamron G005 SP AF 60mm f/2 Di II LD Lens for Canon (pictured) for $524. This $100 mail-in rebate chops it to $424. With free shipping, that's the lowest total price we could find by $26. This 13.4-oz. lens works for both crop and fullframe cameras.

Also available is the Tamron SP AF 10-24mm f/3.5-4.5 Di II LD Lens for Canon for $499 before this $50 mail-in rebate, $449 after. With free shipping, that's the lowest total price we could find by $31. Rebate ends September 30.