Where to find email list?

There are lot of paid services. Just two examples:

https://www.instaaa.com/
https://www.aidem.network/

But you can do it manually too for free:

https://loopinput.com/140-places-to-post-your-companys-startup/
https://airtable.com/shriIvyyV3gAJf0x4/tblcakhoBi0A33QhB/viwWIaPD1CBQtE5e1

Many websites for purchasing email lists can be found on the internet, but it is advised to not purchase shelf leads or outsource the lead generation process to another firm because the authenticity of those leads can never be determined unless they are purchased and used. Also, it is the business that has the most empathy for its target audience and is capable of finding relevant and convertible leads more efficiently. Rather than outsourcing the lead generation and prospecting process, a business can use good lead generation tools and carry out the prospecting process by themselves.

Aeroleads is a good example of the top prospecting tools as it leverages LinkedIn, Angellist, Crunch Base, and other partner sites for finding contact information of individuals and businesses, which makes it great for both B2B and B2C firms. This tool can produce the contact details of hundreds of prospects when a relevant search query is passed on LinkedIn search, making use of search filters further enhances the quality of the search results in terms of their relevance as prospects. Aeroleads also allows the user to individually select the search results that are believed to have a higher chance of conversion and also has a data verification system in place that ensures the quality of information being extracted from it. This whole process can be carried out by the business firm itself and makes sure that good quality sales intelligence is being generated.
https://aeroleads.com/

If you know your lead’s name and company domain but not their email, you can use https://snov.io/email-finder to find it for you. Use this feature to complete your prospects lists with quality contacts. It is all-in-one email outreach platform that will accommodate all your needs, which is why we never stop developing new useful features.
It helps to find leads.

@nosyboy not sure if it helps, but I run a newsletter teaching those who are interested in growth about web-scraping and automation.

If you want any of those lists scraped let me know.

Or if you're keen to learn join us > http://scrapediary.com/