The fastest way to accomplish this is probably to use Fiverr.com and hire someone to scrape the email addresses and send them to you in a spreadsheet. Or post an ad on Craigslist with a description of what you want and you will get a ton of responses. On Fiverr perform a search for "scrape emails from a website" and you shouldn't pay more than $5-$10 for the work. For DIY, you can use something like Import.io or Parsehub. The general term for this type of task is "website scraping." From a business perspective, I think it's better to pay someone else to do it because it costs nothing and will be faster than doing it yourself. Lots of websites block web scraping these days but people who sell scraping as a service will know how to get around that type of barrier.

Totally agree with Jeffrey on this. Also most no code parsing tools do not really work as expected most of the time. And websites change from time to time, rendering a one-of solution useless after a change in the code.
Plus you only pay for results and can determine the format you need for further processing.

Microsoft Excel has included many new features that have made the spreadsheets much easier to use. The first step in creating your email list from Excel is to prepare your list, meaning that you use a header row to define the content in each column of your spreadsheet. Managing email lists requires you to be knowledgeable about many list-building and management hacks.
You can read more here: https://www.campaignmonitor.com/resources/knowledge-base/how-do-i-create-an-email-list-from-excel/
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath

Agree with others that, if you really want to do this, hire someone via a freelancing site.

But I'd ask first whether you really want or need to do this. Emailing people who haven't raised their hand to hear from you will almost definitely result in low opens, little engagement, and a problematic sender score.

You're better off attracting leads to you rather than landing in their inbox uninvited.

This can be so hard when you're a new business and you don't yet have a list. You might have to rely on paid tactics (ads and social posts) more at first than on organic. But, with the right strategy and content, eventually your organic will overtake your paid and you'll have an engaged list that actually turns into leads and customers. Not unsubscribes.