4Jays and Phoenix games aren't too far away from each other so you can hit both if you're going to be using Highway 5. If you like scenic routes, take Old Bailey Road to go between the two. 4Jays has some really odd hours, so I'd recommend calling them before you go.

Somewhere in the San Francisco/Bay Area there's a mini chain of stores called Space Cat. Never been there myself but it's supposed to be decent.

Los Angeles has a bunch of stores but most are picked clean regularly. A&J Games hasn't been mentioned yet and it has a good stock of classic stuff.