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Microsoft customers can save between $20 and $40 on a one-PC, perpetual license of Office 2013 by purchasing a "product key card," a retail offer that consists of a 25-character activation key.



From Computerworld:
Product key cards, or PKCs, debuted three years ago alongside Office 2010 as a replacement for Microsoft's long-standing upgrade policies, which previously offered current users of the suite a lower-priced edition when it revamped the bundle.

Microsoft prices Office 2013 Home & Student at $140 on its e-store, and other online retailers, such as Amazon.com, sell that edition -- which includes Excel, OneNote, PowerPoint and Word -- for the same price. But retailers, again including Amazon, also sell a PKC for $20 less, or $120. That's a 14% savings.
  Office 2013 pricing loophole discounts suite by as much as $40