I just went to the Apple Store at South Hills Village mall. It's quite a long drive from me, so I took a risk. Went there to return an iPhone 4 Dock in hopes of exchanging for a Bumper (even black at least) but the woman helping me said there were none in stock.
Was just getting ready to walk out the store when I randomly decided to play around with an iPad for a few minutes. I heard a kid ask another girl if they had any iPhone bumpers, and she said they might have some in back... So I walked towards them and of course, a guy comes out with a cart full of Bumpers -- black, white, and blue. "No green, huh?" I said, we laughed and he was just as bummed out about it as I was. But they had white, which was my second choice, so I lucked out. I'm happy with it. 🙂