I assume there are workarounds to get some amount of data for free, but the fact is, if you want high volumes of professionally-gathered data, you pay the peopl

I assume there are workarounds to get some amount of data for free, but the fact is, if you want high volumes of professionally-gathered data, you pay the people who do that for a living. Give Dun and Bradstreet a call, or use their web interface (ZapData.com). There are huge amounts of criteria you can search on; industry, employee size, and the like are two of many.