Microsoft and Prometric are running several different discount promotions for certification exams right now. Some of these are pretty short time frame, so you should take advantage of them before they expire.
You can get 40% off any Microsoft Certification Exam by using the discount code NAM40UP through March 13, 2009
You can get 40% off the 70-432 Exam – Microsoft SQL Server 2008, Implementation and Maintenance by using the discount code FTKSQL8 through March 31, 2009
You can retake any Microsoft Exam that you don’t pass the first time for free using their Second Shot promotion.