Enterprise Edition

Enterprise Live On-Premise
Price: $40/user/month
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Price: $480/user (minimum 10 users)
Platform: SQL Server 2005, 2008 or 2012
Price: $720/user (minimum 20 users)
Platform: PostgreSQL 8
Price: $720/user (minimum 20 users)
Platform: Oracle 9i, 10g or 11g
Price: $720/user (minimum 20 users)
Platform: IBM DB2 9

Professional Edition

Professional Live On-Premise
Price: $25/user/month
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Price: $300/user (minimum 10 users)
Platform: SQL Server 2005, 2008 or 2012

Community Edition

Community Live On-Premise
Price: $10/user/month
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Price: open-source
Platform: SQL Server 2005, 2008 or 2012