Apollo is a data-first engagement platform that gives reps the ability to dramatically increase their number of quality conversations and opportunities. Reps are empowered do more than just conduct outreach - they learn who to target, how to reach out, and what to say at speed and scale.
There's nothing to lose! They have a pretty good trial - with 50 free credits to try out the service.
Adapt is a B2B contact and company database provider across multiple industries. Adapt has 100 million business contacts, including industry-specific company database and contact information such as job title, direct dial, and email addresses.
It's affordable and they seem to be able to find a wide range of contact details. They have a nice Chrome extension which works well.