La Comer is a complete 'north american style' grocery store. Good selection, perhaps not as good as at home, but still has everything you might want. There are reusable bags in the kitchen to take with you shopping.
Vallarta's newest grocery store. This store is the higher-end version of Comercial Mexicana and has more options for organic, gluten-free and imported foods. Costco is right next door so you can visit both in one fell swoop.