B&H Photo is offering the Bower 24mm f1.4 lens for $500 with free shipping. This is one of the many names of Samyang lenses. This is available in five SLR mounts (Canon, Nikon, Sony Minolta Alpha,
Pentax K, Four Thirds) and one mirrorless mount (Samsung NX). Samyang is a Korean company :)
UPDATE (5/22/13): The Pentax K-mount is going for $700! The other brands remain at $500. Thanks to one of our readers for the alert!