Games sold for x game?

Hi all,
Didn't know what to the title as nor what it would be posted under.
Anyways does anyone know a site that lists game (dvds) and list how many units have been sold?
I always see people going on about how much this game has sold over this x amount of time and for the consoles how many have been sold with but never any site that collects this data apart from wiki that kind of sometimes has it.

I haven't look into the website in too much detail but I found this website that might help: www.vgchartz.com :D (I seemed to find most of the infomation by clicking on the different chart headdings at the top of the webpage)