Amazon.com has the Canon EF 50mm f1.4 USM Standard & Medium Telephoto Lens for Canon SLR Cameras for $299.99 with Free Shipping. On the right of the loading page, choose Amazon as the seller.

50mm standard lens with f/1.4 maximum aperture for Canon SLR cameras

2 high-refraction lens elements and Gaussian optics help eliminate astigmatism

Delivers crisp images with little flare at the maximum aperture