Cooking in Cancun
When I lived in Playa del Carmen we had to go to Cancun for groceries. Chedraui and the Comercial Mexicana are pretty close together and between them have most items: meat, produce, cheese, chili pastes, corn and wheat products, chicken. Fish is sporadic but can be very good. About one trip in three I could buy fresh boquinette.
When you are value-pricing shrimp there, remember they all have the heads on!