GetResponse has a pretty elaborate pricing roster. With 4 main plans: Email, Pro, Max and Enterprise, you will always find one that suits your needs. They offer great discounts when you pay for 12 or 24 months.

All plans include unlimited emails.

The Email plan starts at $15 / per month for up to 1,000 subscribers, the Pro starts with 5000 subscribers with $49 / per month. The Max for $165 / per month for 10000 subscribers and Enterprise for $1,199 for more than 100000 subscribers.

Each plan offers specific features with the biggest gap being between the Email and Pro plans. For example, you will only be able to create webinars and automated segmentation in the Pro plan.

You can try GetResponse for free for a month, no credit card required. 
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You will get 18% off for 12 months and 30% off for 24 months.

GetResponse offers one of the best discount for non-profit organizations with 50% off on their bill. 

As most email service providers for SMB, GetResponse pricing is based on the size of your subscriber list. Which makes it easy to know how much you'll pay in the near future.

GetResponse is actually one of the cheapest option ($15/per month) for small a list. Though it is not offering a free plan for same list size like Benchmark or Mailchimp With that being said, the Email plan is more than enough for companies with a small list. 

For bigger companies, the Pro plan will be required as they offer abandoned cart feature and more that you'll need.
The Pro plan can get you up to 100,000 subscribers if you need some of the features offered in the Max Plan. Like more webinar attendees, more team members in the tool or a custom DKIM.