Requeson is very similar to Ricotta. In the supermarkets you can but it in a plastic container like you would ricotta. If you go to a cremeria (a cheese and cream store) you might find it in small bags, but if you go to the market it comes as the picture shows wrapped in a banana leaf! (very organic and environmentally friendly).
This market is the market in San Lucas Sacatepequez on the way to Antigua from Guatemala City.