Ask HN: How to find people to cold email for my SaaS?

Hi HN,

I have an idea for a small SaaS business.

I'd like to follow the "lean startup" approach: find customers first and then build the product. So I plan to cold email a few companies to get their thoughts on my idea.

My target customers are small companies in my city, that have a website, and that are currently hiring.

However I have no idea where to find the emails of my potential customers. I'm willing to do some scrapping, but where?

Do you have any advice to share on this? Thanks!