For some reason the companies only get FCC certification and don't think anyone in Canada would be interested in these also. Industry Canada as I understand accepts the FCC testing and approval but they have to submit it to Industry Canada and the fee to have it approved and entered in the radio equipment data base.
The Canadian rules for AM is the same as part 15 AM....100mW into final and 3 meter antenna.
The Talking Sign and the Procaster are approved here because they are made here.
I think that Artisan on Part 15.org is in discussion with Information Station Specialists to get the Talking House certified here.
Hope that happens.
As for Mexico, I wonder what the rules are there for unlicensed radio?