Like this one? It was announced in the keynote with the phone. I suspect covering up the antenna was the primary goal of this product design. Steep price, but it does include its own metal buttons.



$30 at the Apple Store: http://store.apple.com/us/product/MC597ZM/A?fnode=MTY1NDA0NA&mco=MTgyNjczNTE

The iPhone 4 tech specs, showing all the available colors: http://www.apple.com/iphone/specs.html

Close-up look/review: http://www.ilounge.com/index.php/reviews/entry/apple-iphone-4-bumper/