I checked the MS store and did not see any additional voices for sale. I found that there are 2 English desktop voices installed in Win 10 Home, Microsoft David Desktop and Microsoft Zira Desktop. My HS3 system is still on an XP system, so I can't test to see if the example works on W10.This is a wee bit off topic but I will add my 2 cents here because I found this thread looking for TTS information.
I think the basic W10 install only has Mira and Mark - at least that's all I see on my W10 that upgraded from 8.1.
If you go to the Windows 10 'Time and Language Settings' and look under the Text-to-speech section, the voices you see there are what is available on your system.
