Those who were previously enrolled might find a separate group of CAN-US-MEX offers, my father whom enrolled last year had the option for $29/20GB but not the one I noted earlier, whereas I could not see this offer but could see the $30/30GB
After enrolling you can look to swap subscriptions in the app, I recently enrolled at $35/10GBs but I was able to swap it to $30/30GBs in the app, my 3 other family members also experienced the same.