Google "Before this voicebank is discontinued, you are free to redistribute part or whole of this voicebank in any way, with or without edits, as long as you correctly attribute the voicebank name and author, and clearly state any changes you have made.", and you'll get a list of redistributable voicebanks.
However, please carefully read their terms of use before using them, because google not only returns pages with the exactly same search terms, but also returns pages with similar ones.
You can also find some on
my github homepage