Canon offers the factory-refurbished Canon EF 40mm f/2.8 STM Camera Lens, model no. 6310B007, for $99.99 with free shipping. That's $50 under the lowest total price we could find for a new one, although we saw another refurb unit for $2 less last fall. This 0.3-lb. lens is for use with most Canon SLR cameras. A 1-year Canon warranty applies. Deal ends September 7.