Grahamhsu on 01 December 2008
The best deal you can do is to rent the GoTY version and buy a copy of the original. The GoTY version downloads shivering isles into your harddrive or just borrow your friends shivering isles disk from their GoTY.
If you want to be even stingier you could buy a used copy of the GoTY edition and return it after you install and just say you didn't like the game.
