They are not that expensive from here:
https://www.bhphotovideo.com/c/produ...dot_black.html
Buy two and you get free shipping.
I am currently testing this in my home system (Elan, Radio Ra2, Sonos). Works quite well. I stumble more than it does, ie mispronounce words, get tongue-tied etc.
When this is released in Canada (presumably this year), I will be deploying it as an option to my AV client base.