http://groups.google.com/group/alt.games.video.xbox/browse_thread/thread/d8d50603bea98eb6 - Posted nearly 3 weeks ago
http://www.gamestooge.com/2010/06/19/e3-10-xbox-360-slim-selling-out/ - posted 4 weeks ago.
Amazon were out of stock a week after it released.
Know what they all say? Back in stock from 13th/16th/19th July.