The owner of European Aviation has one in his back garden (spooky as it fatally crashed there..) and the Egyptian Grocer has one in his garden nr Oxted as something for the kids (presume grand kids?) to climb in/out/over.
There also used to be one in the ditch at Fairoaks behind the blister hangar on the south side, but that may have gone now.
Failing that, Aces High at North Weald would probably know where to source one as they do that regularly for film work, but the price may be imaginative