[Feagil of the shadow]

Right I was just about to be led to the bandit camp, and I was asked to put in cd 4. Only problem being cd 4 has one massive split down the center of it, and I'm pretty certain I didn't do that. I brought this game well over a year ago, just never played on it before, and the cheapest I can now find it is like £40!!! Does anyone know anywhere that sells the game cheaply or, would some kind soul copy and send me CD4?