Details.
Buy a bottle of Havana Club and some cans of TuKola, then enjoy makeshift cuba libres at Havana's malecón. Standard government-regulated beer costs 1 CUC, hotel beers cost 2 CUC, and beers at the Plaza Vieja micro-brewery cost 3 CUC. Rum is also available at very low prices, with 950 ml costing about 75 cents in the example described.