Prices:
$10 - Windows 7 - (Professional,Home Basic, Starter and Ultimate) 32/64 bit
$7 - Windows Vista (all versions)
$5 - Windows XP (Professional, Home Edition, and Media Center Edition)
$7 - Office 2010 (Professional Plus, Standard)
$5 - Office 2007 (Enterprise, Professional, Standard, Ultimate)
Disclaimer:
I offer a 30 Day replacement guaranteed on all my "Windows keys",
this option is only available when the license expire or the key is invalid.