The Booxtor's shop is :
http://ereader-store.eu
There is the TTS function in the M92, but this not very good. You can't put the Ivona voice on the classic (Booxtor's model) M92. The Ivona is the TTS solution for the polish seller.
Booxtor had published a video with a test of an other solution than Ivona :
First impression of Acapela TTS in Onyx Boox M92