I recently sold a car on ebay. It came about as a result of a 'free listing' promotion that was offered. You may check to see whether there are any current offers.
Depends if you REALLY want to sell it ! Free ads don't really capture a large audience.
If you don't mind spending a little to normally get a result then put it on Ebay auction with a reserve price but be realistic about what you ask for it. Look on Parker's on line guide to see what is possible.