[quote name='JolietJake']Ugh, never rub a disc in a circle.[/QUOTE]
Seriously. It never fails to amaze me how many people do that.
OP, if these were new games you should have been putting them in the case when done.
Also, never lay the side the laser reads down on anything other than a clean cotton cloth. Not your bedspread, not your 360, not anything.
If used, you should look at them before you walk out of Gamestop and they have a guarantee if they don't work anyway. If you get your games used elsewhere, ask to inspect them before you buy.
The best way to deal with a scratched disc is to never do things that get it scratched to the point the disc in unreadable in the first place.