I won't swear to it, but I have to believe that Calvert-Woodley near Van Ness should be able to help you out. Also, Litteri's Italian Market off New York Avenue has a very large selection of Italian wines across a wide price range.
I've also bought some (can't remember the label, but a friend said it was the exact brand they serve at Buca di Beppo, without irony) at the Trader Joe's in DC.