I know they used to have the "Mr. Davis" t-shirt at D-Squared. Not sure if they still have it, but that's the first place I'd check.
You could also ask Thalia Tringo- according to the Somerville News, she was selling them at Midnight Madness http://www.thesomervillenews.com/archives/32891
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You could also ask Thalia Tringo- according to the Somerville News, she was selling them at Midnight Madness http://www.thesomervillenews.com/archives/32891