Monterrey is Mexico's most American-feeling shopping city — flagship malls (Galerías Valle Oriente, Plaza Fiesta San Agustín) match anything in Houston or Dallas, with full luxury rosters in San Pedro Garza García. Centro and Barrio Antiguo offer traditional markets and pedestrian streets. Souvenirs lean regional: glasswork, sarapes (better in Saltillo), leather, sotol/mezcal.
In June heat, malls double as survival zones. All have fast Wi-Fi, decent food courts, and reliable taxi/Uber pickup.