I have certainly found some familiar snacks, even at the smaller food stores. However, as others have said, imported products can be pricey. For example, a bag of Doritos was $500J at the L&M Market. We opted, instead to try out some of the locally packaged snacks, like plantain chips.

As an aside, some things I found to be dirt cheap compared to the US. I was floored when I went to purchase a lighter and the price was $33J. That was the first time I bought anything with a $50J bill.