We have an open office. So when they enter, 11 people immediately look up at them. This can apparently be somewhat intimidating, based on their flummoxed reactions. They usually ask for a business card so they can call us later. I sometimes offer them mine, since my card doesn't have a phone number on it. Then they beat a hasty retreat.
Lately we've been trying a new tactic - not acking their presence when they come in. There's no receptionist (of course), and it's not clear who they should attempt to speak with. None of us really want to listen to their pitch or take their flier anyway, so playing the game of chicken with the other folks in the office sort of emerged as a default behavior. Who will be the first to crack at their nervousness, make eye contact, and thus become the dupe left holding the flier or handing out their business card?
I almost feel sorry for them. Almost!