FindThatLead

Even with three coupons, you get only 6000 credits. One email one credit. Do you want to check an email ? another credit. That's not all: most of emails are "guess" only, not the real ones. But all contacts I found out had a Linkedin page. RGPD compliant? of course not. They heavily scraped Linkedin and now they sell a content they don't own. I made a research which cost me 7800 credits, so it too two months. But in the end I had only 3000 emails and most of them were "guess" only.
If you want a big list, this tool is useless. If you want a small list, try yellow pages.