The Apple Mac OS X Version 10.5 Leopard update is already available for pre-order on Amazon.com.
Amazon does not give a shipping date yet, but Apple said the new Mac OS will ship in October.
If you pre-order now and the price gets lower on Amazon between now and the release date you get the lowest price.
Steve Jobs just showed the final functionality of Leopard last week at the WWDC 07. Leopard got handed out as beta to the attendees of the developer conference.The Apple Mac OS X Version 10.5 Leopard sells for $129 on Amazon.
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