By the way the company info in Jigsaw is all free. You can also trade contacts. I've been using Jigsaw for free for 3+ years now.
As for Zoominfo, they currently have a deal where you can get to use it for 2 months free if you provide an email address where they would track the info (which could be one of your less used email addresses).
Of course, you can X-ray using strings like the ones Gary has provided. Searching from within is often more precise (and also supports Boolean). Using both ways may be beneficial.