in the past i have used a small soldering torch very carefully to fix scratched discs.. it does work but u gotta be carefull...
-easiest answer... use ur computer to upload disc to ur harddrive and then burn a new copy..
-i do about 100-150 discs a month for ppl, myself, or anyreason... shoot i dont even have many original discs i run in my car seeming as though its about 10 cents for blank disc and the sound quality is no different
but that dont help if u dont have a burner.. in which case u can get em cheap.. i just sold my old external one for 30$..lol
*oh btw i have also heard that a polishing wheel on a grinder with a wee bit of compound works to fix scratches but i have not tried this myself