No new at bestbuy, but the warranty only covers the system...
how long ago did you buy it?
your game disc mustve had the 90 dat limited warranty. you might be outta luck and have to get a new one. use kijiji/craigslist, theyre tons of copies floating around.
or as suggested get someones disk, install it (which you shuda done in the first place) and then try your disk. but if your disk looks gone id advise dont put it in the console.
also, make sure you extend your warranty with microsoft, its like 20 or 25 for a yr, be sure to do it before your warranty ends.
imo, mw3 svcks, dont waste your time, mindless ish thats jist straigh craptacularness, good for nothing. the campaign svcks, nothinnhg but point and shoot blah blah
thats about all i have for u