Seeking real gingerbread
I'm not sure if it's what you are looking for, but I was at the Downtown Crossing Holiday Market yesterday. They have a booth from the Swissbakers there. They were selling gingerbread men, which the lady said was "European-style" Gingerbread. It was almost like a dinner roll consistency, with a very slight sweetness to it, and a mild gingerbread/molasses flavor. It reminded me more of Portuguese sweet bread than the usual gingerbread cake or hard cookies you find here.
I would think Karl's Sausage Kitchen in Saugus would be a likely bet, they have all kinds of German-style (and in some cases, actual German) baked goods and they bring in a whole bunch of other stuff from Germany for the holidays, but call ahead to be sure. Or just go for the drive and come home with all kinds of goodies...
Karl's Sausage Kitchen
142 Broadway, Saugus, MA 01906
I'm not sure if theirs is the gingerbread you're looking for -- I go there for the muffins -- but the Gingerbread Construction Co. springs to mind. They started off with, and still make, gingerbread houses, which I think require the harder, German style.
They're in Winchester and Wakefield.
Gingerbread Construction Co
562 Washington St, Winchester, MA