...in hopes of one day tracking down the missing disc (or discs)? Like say Panzer Dragoon Saga is being sold for 75 bucks because it's missing disc 3. Would you buy it for the cheaper price if you were in the market for that game in the hopes one day you'll find disc #3 for sale? There's always the chance you'll never find it, alone, but would you take the risk for a fraction of the normal asking price, and if so, what % cheaper would it have to be for you to bite?

Have you ever does this before? If so, did you ever find the missing disc(s) yet?