This may sound really stupid but you can make your own stamp easily out of a potato. You would probably need to use a yam or one of those HUGE baking ones that you can usually find in the organic section of your supermarket. Cut in half, then, peel the skin partially (about an inch) off of the larger end. Leave the skin on the end you will hold in your hand. Then cut out the shape you want with either a knife or cookie cutter & you are ready to go. Practice on old paper bag or poster board first.
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