If you have any coding knowledge, you can get similar-quality voices for much cheaper from Azure, Google, AWS and IBM Watson. Azure gives you 500k characters for free per month, and then it's $16 per one million characters, paid per character. If you're using this to generate voice overs / videos, these rates are so low that you can basically forget about them existing.

You have to use the API, but if that's fine with you, it's definitely worth it.