Of course! Right next to hostel Heike are two clothes places selling mostly tourist stuff. There are a couple of second hand stores, one on the road going to the airport. You can buy ear buds at a farmacy looking place below Natraul Mystic restaurant. I'm sure you can also get them at Rosa Blanca farmacy and any of the Chinese stores that sell other stuff besides food.

There are also clothe stores on the street above Main Street where El Precado restaurant is.