Where Can I Find Ivona Voices for Linux?

[Linux for blind general discussion]

Well, for nearly 2months we are enjoying an Amazon Alexa.  The voice is quite 
good, so I looked around, found a site or company readspeaker with some demos. 
Some have a splicing affect, but still it seems like quite clear speech. Well, 
readspeaker replied, said they only sell commercial, I should try nextup. They 
just wrote this evening, but they only sell Text Aloud for windows.
Sure I enjoy my DecTalk, but I would rather listen to something like voices in 
SAPI4 such as Mary. Thanks so much in advance for any guidance
Chime