Auto trader, Preloved, ebay of course but be prepared for a LOT of interest and not so many bids and traders contacting you trying to get a bargain. Good luck.
An enthusiast site can also be a good idea! Theyll unfortunately have a very good idea of what the car is generally worth and will spot any common faults a mile away, but better than months of ebay people kicking tyres.
Comments
Cheap car I would say Gumtree.
Anything else, Ebay or Autotrader.