Best Buy is hosting an ad for a Toshiba laptop running Mac OSX.
Update: Note that the bottom of the page indicates the system comes installed with Windows XP. Thanks to Sidney who pointed this out in the comments:
Microsoft Windows XP Home Edition operating system preinstalled; software package included with Sonic Solutions RecordNow! Basic, InterVideo WinDVD 5, Microsoft Office OneNote 2003 and more
Michael Castellon 
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