Microsoft has an ISV package for MS Partners - $375USD for an MSDN subscription.
Microsoft Empower for ISVs offers the following benefits:
Up to five (5) software licenses (for internal use):
Microsoft Windows® XP or Windows 2000 Professional
Microsoft Office XP (Premium or Developer Edition) or Microsoft Office 2003 Editions
One (1) software license and up to five (5) Client Access Licenses (CALs) for:
Microsoft Windows 2000 Server (Standard or Advanced Edition) or Microsoft Windows Server™ 2003 (Standard or Enterprise Edition)
Microsoft Exchange 2000 Server (Standard or Enterprise Edition) or Microsoft Exchange 2003 Server (Standard or Enterprise Edition)
Microsoft SQL Server™ 2000 (Standard or Enterprise Edition)
Microsoft SharePoint™ Portal Server
Development and Testing License: One (1) MSDN Universal Subscription media kit and five (5) user licenses*
One (1) MSDN Universal Media kit (DVD)
Each MSDN Universal subscription is a single user license for development and testing purposes and includes Microsoft Visual Studio® .NET Enterprise Architect Edition, the full range of Microsoft Windows Server System™ integrated server software, all Microsoft operating systems, Microsoft productivity applications (Office Developer Edition, Microsoft Project, FrontPage®, Visio®, and MapPoint®), as well as access to SDKs, DDKs, and the MSDN Library. Each subscription also gives you priority access to new product releases, updates, and betas through the MSDN Downloads site.
Note: Microsoft Empower for ISVs is a one-year initiative with an opportunity to renew for the second year. All initiative benefits lapse once membership expires.
* MSDN Universal Subscriptions for ISV Empower members do not include any phone-based incident support.
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