Support your local community by selling their products in your hostel. This is a win-win situation for the producers that get a market, your hostel that can profit a little on promoting local products, and the guests that are often happy to find local products within the hostel.
The photo above is from Hostel Catavento in Alto Paraíso, central Brazil. There they sell locally produced snacks and products.
In Stasjonen Hostel in Lillehammer (see photo to the right) they use local products to decorate their café as well as to have them on display for sale. In this way, guests are free to buy products made by a local artist while enjoying a coffee and a homemade freshly baked cake.