URGENT: Targeted Email List Builder Needed (1 million plus list, niche-specific, required)

I want to kick-off a new set of marketing campaigns and for that I need a rock-solid, industry-specific email database. I will share the exact niche and ICP once we start, but think B2B decision makers within one clearly defined vertical... (Budget: $2 - $8 AUD, Jobs: B2B Marketing, Data Collection, Data Management, Data Mining, Email Marketing, Google Sheets, Lead Generation, Node.js, Python, Web Scraping)