Four pre-stamped postcards were available at the post office in "The Common" between August 13-15. Postcards were sold with and without postal cancellation depending on the time of day (postal employees only worked limited hours each day, and post cards were only hand-cancelled when postal employee was present). 12000 total cards were made, 3000 of each design.
see also Lousy Postcard, Dandelion Card, Coven Card and Big Scoop Card