[Mandingo]

I've been to California, but are Gamestops nation wide? There must be alot of shops then.

Yes, Gamestop stores in the U.S. are everywhere like McDonald's. They are nationwide and also global:

Originally Posted by wikipedia

6,500 retail stores throughout the United States, Canada, Australia, Ireland, Denmark, Finland, Germany, Italy, New Zealand, Norway, Spain, Austria, Puerto Rico, Switzerland, Portugal, and in Sweden. GameStop opened around 400 new stores for the 2009 business year.[4]

And since Gamestop storefronts tend to be smaller than a lot of retail stores, I guess it's very easy to start up these businesses. It's no wonder why so many have sprung up over the years.