Game information [nintendo.com]
The game is $14.99 on the US eShop, but if you change your region to Mexico you can get it for ~ $7.88.
You can access the Mexican eShop by changing your region on https://accounts.nintendo.com/
to Mexico. OR you can create a new Nintendo account and set the region to Mexico. If you change your existing account and have a balance you will lose that balance if you change regions. That's why I prefer to create new accounts for different regions.
To create a new account and access the Mexican eShop:
1. Go to https://accounts.nintendo.com/
and click Create a new account
2. Complete the infromation and make sure you choose Mexico for your region
3. On your Switch go to System settings and under Users click Add User and enter the email you signed up with
4. When you go to the eShop on your Switch choose the user associated with Mexico
I was able to pay with a US credit card, but you may want to make sure you're using a credit card that doesn't charge foreign transaction fees.