WSC Real 2011 (Xbox 360) (PS3)
Operation Flashpoint Red River (Xbox 360) (PS3)
Mortal Kombat (Xbox 360) (PS3)
Portal 2 (Xbox 360) (PS3)
Seems worth it when you consider Portal 2 is a very short game from what I have heard and you may want to trade it quite quickly? And I got Real 2011 for £23, which is another of the trade options.