Go to Google Cloud Services, you can setup a free account and get a trial which lasts for 12 months, but there are limits.
Google Cloud Services is a paid service, so BE AWARE of your usage/expirations.
Google Cloud Text To Speech Free Limits
Standard (non-WaveNet) voices up to 4 million characters per month, and WaveNet voices are up to 1 million characters per month. Character counts include SSML tags, which the application does use, so, you can't go by just the normal text alone.WaveNet and non-WaveNet voices are indicated in the voice selections.