Good morning everybody.
I’m about to buy the “Boron 2G/3G Global Starter Kit with EtherSIM”. I live in Brazil and would like to know if there is coverage in my country. I would like to know if there is also a cheaper kit here for my region.
yes 
you can check coverage here:
https://docs.particle.io/tutorials/cellular-connectivity/cellular-carriers/?tab=CountryDetails&country=Brazil&device=Boron%20BRN314%202G%2F3G%20Global%20EtherSIM
Not sure but you can use Particle referral program with some of your friends 