Best database to find leads?

Hello,

Would love some tips and feedback about the best ways to finding leads. Going through LinkedIn or Googling it out, what other methods are you guys using to find leads about the Website/Company?
Besides scraping it yourself, maybe you guys have some feedback about certain contact data providers like Zoominfo or Oxyleads?
Would love some free options, but I highly doubt it is possible and convenient. Any methods and feedback about existing services are welcome!

Zoominfo has great e-mail database, but there is an issue - price. I have used Hunter.io for quite a while, but the databases seem to not get updated frequently. Also, the Leadgenius is nice!
However, OxyLeads won me with their extensions. That one is a beast lifesaver. After a conversation with their customer support, I got offered a discount and they said I can share it with the world. So in the checkout try applying oxyleads15 or oxyleads25 coupon codes, should give you a lower price. After you try out the trial of course!