Right now Microsot is allowing you to choose free retakes if you fail a test or 2 for 1 specials where you can take a test and give the second taking of that same test to a friend (you could split the cost of a test with a friend) Only one deal applies at a time though, not both. They both end May 31st. Also Microsoft has free online training courses for the MCDST Certification.
The links are underneath the 'special offer' box on this page :http://www.microsoft.com/learning/mcp/default.asp Best wishes----Jim