Dev related question (Audio)

I’m working on a free pet project (here) and I’m limited to create just a few text to speech voices every day using a free (as in limited) service. If anyone have access to, i think the Amazon text to speech… service… thing… whatever it is called, this project could move faster, i have a couple of scripts that needs to be generated using 2 voices, and i only have a few lines made so far (3/9 of them).

To make things clear: since I am doing this for a likely free release, I’m not interested in throwing money on it, that is why I’m asking. Otherwise this can take a few days because - well, free service.