I have a question! Is a " 3½” x 5” properly stamped postcard" a regular index card with a stamp on it or am I supposed to buy special cards from the post office. This is for a mail-in code request.
Thank you,
D.S.
If you have card stock, you can make your own, or I used to buy 3-1/2 inches x 5 inches index cards & they work just fine - buying prestamped is for ease, but watch you get the right ones since there are 2 sizes: