Scotch Heavy Duty Shipping Packing Tape, Clear, Shipping and Packaging Supplies, 1.88 in. x 27.7 yd., 1 Tape Roll with Dispenser

To answer your first question: People send thousands of postcards of the Disney castles and the Grand Canyon and the Eiffel Tour, why not send a small handful of your limited edition cards? I bought some lovely printed postcards from a local artist who did their own block printing. I was concerned the ink would get battered by the sorting machines, so I did a bootleg lamination using clear packing tape .