You can also use photos. Lots of times developing places offer double prints for nothing- or next to it- or you get prints that you really don't want. Just divide the back into an "address" area and a "message area" and there you have it- instant postcard.
Don't spend money to buy postcards! And don't throw away old greeting cards! You can cut the front off of your old greeting cards and reuse them as post cards! Costs nothing!
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