I went today to a Mexican grocery supermarket. It was so fun and many items that I never knew existed, is like opening a new world haha. 
I bought some fresh tortilla and jalapeños pickles. What else should I buy? Or what is a MUST try product or snack from there?

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I find that Mexican grocery stores have the best prices on spices. Between that and the Indian store I can buy almost any spice I can imagine! Very economical too!