Disk Repair

So my 360 scratched Call of Duty 4: Modern Warfare recently and I had the console replaced because the CD tray was unsafe. Now the disk still doesn't work and it's just got one circular scratch that goes all the way around the near-edge. Somebody told me something about a website where you can mail in your disks for a very small fee and they'll fix them just like new and send them back. Anybody know what website this might be? I forgot the name. Also, no point using disk repair fluid. That shit doesn't work well enough to fix a scratch like this. And I'm not comfortable with just throwing this disk out and buying a new copy if it can be salvaged.

If anybody has any suggestions (or knows what site I may be talking about), help is appreciated.

I had a minted PSX disc ages back, which I managed to fix by using the toothpaste trick, and then sticking it in the freezer for a few hours.

Most game stores have disc repair stuff, as well as most Rental stores, shouldn't cost too much either.