First of all Welcome to our Community! Meraki Go is indeed available in the US! You can purchase Meraki Go APs and Subscription Keys through our Partners that you can find in the link below:
Let me know if you have any more questions!
Just to elaborate a bit more on your question, @TongtongX -- Meraki Go is available through all Cisco Registered partners in the US. To make it easier on those without an existing relationship, we've featured a couple fantastic Meraki Go partners on our website, as @Otis_Io highlighted.
As for Canada, we're looking to launch in Canada in the not too distant future. Stay tuned for more details!