Beach Camera via eBay offers the Sigma 50mm f/1.4 EX DG HSM Lens for Nikon, model no. 310306, or Canon, model no. 310101, for $349 with free shipping. That's $5 below our mention from 18 months ago and the lowest total price we've ever seen. (It's a current low of $50.) It features a hyper sonic motor for silent, high-speed auto-focus.