whats the most cost-effective cold email system?

for those of you doing cold email, where do you get your domains and leads?

What's the most effective and not too expensive way of starting cold emails and actually getting responses and booked meetings?

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Hello everyone, I’ve been working in advertising on Meta for years. At the same time, I’ve founded and managed many major pages in Turkey. These include humor pages, lifestyle pages, and pages featuring documentary-style content. Our focus right now is entirely on customer-focused Meta ads. Our goal is to increase product sales and reach a wider audience. We’re looking for someone who understands Meta and is interested in collaborating with us on this. If you believe you have the knowledge and experience in this area, please reach out to me.