The Panasonic 20mm is back in Stock and discounted at Amazon (Click here). It is also in Stock at Bhphoto (Click here) for $399. And a really funny history is happening with the Olympus XZ-1. Every day sicne one week you see price drops on the Olympus XZ-1 on Amazon (Click here). It now gets sold for $420 (yesterday $424).
P.S.: The Panasonic 100-300mm lens costs $513 at Amazon (Click here).