http://www.eastbayvivarium.com/Should have Rough Green Snakes.
Never ever evvvvvver buy a snake from a chain pet store! They are usually imported, unhealthy, mite-infested, unlikely to eat, and aggressive!!
Interesting that you should post this, I have been researching Rough Green Snakes. They're really cute!

I'm aiming to get one sometime this spring/summer. Not so soon though, first I'm getting a Bearded Dragon (in around 3 weeks!!!!! Can't wait!!!!!!), then I'm going to try to get some crested geckos to breed, I want some Flames.... long list! But a Rough Green Snake is next. Why can't I ever have enough $$????
Good luck and have fun!!