hxxp://www.usdoj.gov/ndic/index.htm#Top

Click on "NDIC Publications" on the left. They have national assessments, drug assesments for each major area/city, and drug market analyses. They go over wholesale, midlevel, and retail prices for each drug in each area, who controls what market, where most of the stuff is manufactured and trafficked, and what drugs are their main concerns in each area.