<row><cell><cell><cell>Single post cards sold by the post office<cell>$0.21 each
<row><cell><cell><cell>Double post cards sold by the post office<cell>0.42 ($0.21 each 1/2)
<row><cell><cell><cell>Single post cards<cell>0.21 each
<row><cell><cell><cell>Double post cards (reply-half of double post card does not have to bear postage when originally mailed)<cell>0.42 ($0.21 each 1/2)
</table>
<p>Note: To qualify for card rates, a card may not be larger than 4 1/4 by 6 inches, nor smaller than 3 1/2 by 5 inches. The thickness must be uniform and not less than 0.007 of an inch.
</p>
<p>Source:United States Postal Service; Jan. 1995.