In a much better deal than anything McDonald’s or Wendy’s has to offer, Microsoft is offering the first three Advanced Management or Business Essentials users for a buck. This offer is for new customers and there are some restrictions. Visit Inside Microsoft Dynamics GP for links to the details.
Microsoft Dynamics GP: Three Users for a Buck!
Archived post from 2010. Dynamics GP and the links it points to have changed since; check current documentation before relying on version-specific steps.