For those Chevrolet Avalanche lovers in the Savannah area, Coastal Chevrolet has good and bad news. First, in case you haven't heard, Chevy is putting an end to the adventurous pickup truck after the 2013 model year. That, of course, would be the bad news. The good news, however, is that the automaker is saying goodbye to the Avalanche with a stellar, special-edition Black Diamond model.