Meet inside of a store, not a parking lot, the buyer could have a friend grab the machine jump in their car and take off. The buyer would probably want a demo so try to use a Starbucks, they have plugs and are usually busy. Ask your local sew and vac store if you can use their store as a meeting place, try the library too. If there is a craft fair coming up maybe you know someone who would let you use their booth as a meeting place.