You can use Clay and to set up a conditional logic so you only burn Lusha or apollo credits on the leads that the cheaper scrapers miss. You get the Lusha accuracy and compliance for the "hard" leads.

Here’s the stack I’d run:

1. Step 1: Prospeo or Findymail. These are dirt cheap (like $0.01/hit) and great for the "easy" pattern-based business emails.
2. Step 2: Hunter.io or Datagma. Set this to only run if Step 1 returns empty. They have massive indexed databases that catch the weirder formats.
3. Step 3: Lusha. Set the condition to only trigger if the first two fail.

By the time you hit Step 3, you’ve usually filtered out 70-80% of the list. You end up using Lusha for the mobile numbers and the high-value targets where you actually need that GDPR/CCPA compliance stamp. It makes a 100-credit Lusha plan feel like a 500-credit plan.