Much more chance it was because these 100 peso wines don’t taste like 100 peso wines.
The wines, one of them white, one of them red, are sold under the name Seleccion and, as best I can tell (Costco and Concha y Toro both refuse to tell), Costco Mexico retails them exclusively.
Both the red and the white Seleccion are sold by Costco in six bottle lots for just $599 if you have them delivered, like I do, or $481 if you drive to the store in Celaya or Queretaro, like most people do, and pick them up.
I’m actually astounded that Concha y Toro can make and Costco can sell two very good wines at such very low prices.