Retail pricing research

I am looking for an expert who can help me with an extensive research project. I need to gather data on retail pricing information, and compare it nationwide. The research should be a comparative analysis, so I need someone who is experienced in crunching numbers and analyzing information. I'm not sure if I should include other activities besides pricing research since this is such a complex and involved task, so I need advice from an experienced professional. If you feel that you are qualified to help me with this project, I would love to hear from you.