BuyDig offers the Canon EF 40mm f/2.8 STM Pancake Camera Lens, model no. 6310B002, for $149. (Click through to BuyDig to see this price.) Coupon code "DIG5" cuts it to $144. With free shipping, that's $6 under our October mention and the lowest total price we could find by $5. This 0.3-lb. lens is for use with most Canon SLR cameras.