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Take it to a shop that does disk repair! They will resurface the disk for a small fee It should come up as good as new or almost. Failing that, if it doesn't work allthough it should, you will have to buy a new one however it should work fine!
Take the disks to a store, that does disk repair! Failing that,try searching for a special cd/dvd scratch repair fluid. Usually it comes with a polishing spray for shining the disks up after repair!I would not recommend solvents or harsh chemicals, which are not supposed to be used for cd/dvd repair. Toothpaste and vaselene do not work! You need the right tools for the job basically!