? Double Futon Prices are generally not very expensive , the cheapest $ 500 or less can buy , but this is not really a double fold-out sofa bed is best , not very durable , the weight of the case severely shortened life expectancy . Usually a little comparison some good sofa bed price is more than a thousand , this double pull-out sofa texture is better, but still the same shape is relatively simple , suitable for some small units .