Optimum Nutrition Serious Mass Weight Gain Powder, 5.44 kg - Chocolate Peanut Butter £32.99 @ Amazon
usually 1kg of protein powder costs £15, for 5.44kg this is a amazing deal! the powder comes in many different flavours, personally i really like the taste and it mixes well. its got a good ratio for nutrition per 100g. yes its mostly for mass gaining but with 50g per serving it would work very well with cardio for lean gains!