Mac OS X 10.7 Lion $30
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Apple has the just-released Mac OS X 10.7 Lion available for download from the Mac App Store for $29.99. This major upgrade to the Mac operating system is available exclusively through the App Store, and this is a great price. Some new features in Lion include enhanced multi-touch gestures, full-screen apps, auto-save, and a new Launchpad for instant access to all apps. There's no sales tax on this download.