I read somewhere, was it here?, some years ago a guy'ad taken that white spray paint they use for used car windows and delclared his willingness to "buy your used moped" and his telephone number on the rear windows of his van. Claimed that it was very successful.
Probably true that the suburbs are the best places to find these. Just like was said, lots of kids had them in the seventies and have forgotten by now that they are resting on flat tires underneath the old shovels and spare boards in mom and dads' garage. But four to five dollars a gallon is going to REALLY drive demand for this stuff through the roof. Act now.