Are there existing data sets that detail information about DoD source selections?
You will have quite a challenge to obtain the data you may be seeking. The best and perhaps only available source is the Federal Procurement Data System
. There is a "Reports" tab at the top that leads you to various existing reports that you can view. The description on that page reads: "The Federal Procurement Report data can be used for geographical analysis, market analysis, and analysis of the impact of the congressional and presidential initiatives in socio-economic areas such as small business. The data is also a reliable basis for measuring and assessing the impact of Federal acquisition policy and management improvement." Unfortunately, the primary reports showing as of the date of this response are only through FY 2007.