Mailshake - Send up to 2000 emails per day. Automated follow ups, on-click emails, and integrations. Best for high volume sending. $59 / month.
Lemlist - Send up to 500 emails per day. Similar to Mailshake, but with lower daily limits and some additional features. Lemlist can automatically warm up your email domain and help you maximize deliverability. Best for just getting started with cold email. $29 - 49 / month.
Coldemail.ai - Cold email tool that sends between 300 - 1000 emails per day depending on your plan. Easily import from Google Sheets. Best for the price. $9 - 19 / month.
All cold emails require a warmup period to send that volume of emails. Read a guide on email deliverability here.