Is there any way to search by region? I wanted to build a search restricted to vendors in New England, where shipping costs to Boston are probably lower, but I

Is there any way to search by region? I wanted to build a search restricted to vendors in New England, where shipping costs to Boston are probably lower, but I couldn't immediately figure out how to do so. For obvious reasons I expect many if not most of the vendors to be on the West Coast, but hope springs eternal...