I can get about 90% of the quality of 15.ai currently. I think I could surpass 15.ai but not without some help.
Here's a sample from a TTS model + vocoder I released for it. I've no wish to deter the motivated, but it'd take a bit of figuring out how to set things up and you'd need to read the docs and code to get oriented :)
https://m.soundcloud.com/user-726556259/sherlock-wavegrad-sa...
Links to the models are here: https://discourse.mozilla.org/t/creating-a-github-page-for-h...
Is originally trained on two novels read by the same narrator on LibriVox (ie in public domain)
As some of the audio is read in different accents to the main accent used, ideally the different accent audio would have been removed. Doing so would be expected to help with voice quality, reducing the overall amount used and, as a bonus, cutting training time too.
https://github.com/mozilla/TTS/tree/master/TTS/server
https://github.com/mozilla/TTS/wiki/Build-instructions-for-s...
There's also a version in docker: https://github.com/synesthesiam/docker-mozillatts
And various Colabs too, which are fairly easy to get going with: https://github.com/mozilla/TTS/wiki/TTS-Notebooks-and-Tutori...