Where can I get Kristin Cavallari's D&G sungles that she wears in Laguna Beach season 2?

I fell in love with the sungles Kristin wears in LB season 1 and 2. They're black with a smaller square lens frame with a faded black to violet lens. I found out that they were by Dolce and Gabbana but I cannot find them anywhere. Please help!