In the Mexico website, you can put on search for availability in store. I opened the website and search for the city I live, and it showed which store have it!
I went there just 20 minutes after the store opened and snatched it hehe.
I just learned this trick! It's so nice.
For others, it may be helpful to choose a country that has (English) next to it, in case you don't know Spanish or don't want to deal with a foreign language. I use Finland (English) but can be any of the others. Easiest way to find stock at any store is to type "USA" in the search box. You can then check "Only include stores with availability." That way you don't have to search more than once if you want to check surrounding cities.