Car selling agencies never give you the best price, but can be a good way of getting rid of a car quickly and easily. Be aware though that often, the price they give you online is only an estimate and we've heard tales of people taking their car to one of the sites only for someone there to haggle them down on what it's worth. However, it will save you the hassle of selling it privately and/or having to get work done to fix the faults.