Fallout 3 Collectors Edition (PS3) - Resale value?

Hi, I purchased the Fallout 3 collectors edition on PS3 last weekend and low and behold 19 hours it's finished. Rather naff that I can't go back and do any of the other quests and my save file starts me in the room where I have to make the choice, so I'm not restarting it. So I plan to sell it, what do you think it's worth?