In our area also, the British Heart Foundation will come and collect any usable furniture free which they sell off cheaply to those who can't afford to buy new. If you Google "British Heart Foundation Free Furniture Collection" (or something similar) you may be able to find if there is such a facility in your area. Also the Social Services Dept of your local Council might be able to take or, or some local papers have a "For Sale" section where you might be able to advertise it free, offering "double bed free to anybody who can collect it".