If you want to buy fresh food, or make up your own snacks and meals, use the city's markets . There's less choice in the supermarkets , though they're worth trying for tinned products, as are the delicatessens and small central shops which specialize in tinned fish, meat and cheeses. The cheapest food and provisions shops are those in the Barrio Chino/Raval area, particularly down c/de Sant Pau - which is one of the few places you'll find food shops open on Sundays, too.