State and federal government agencies are a great place to find quantitative data on your topic. Here are a few general websites, as well as some topic specific sites to try.
The BEAM spectrum is a way to think about how you can use sources for your project. What type of information are you looking for? What do you need to accomplish? Construct an argument? Provide evidence? Or just report basic facts?
Remember, not all projects will require you to use sources in all four ways. And some sources will help you in more than one of these categories.
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Each database is going to have a different focus and strength. To be succesful, you are going to have to try more than one of these.