Here is something else people may not be aware of:

HOW TO ORDER THE FIRST DAY OF ISSUE POSTMARK

Customers have 30 days to obtain the first day of issue postmark by mail. They may purchase new stamps at their local post office, by telephone at 800-STAMP-24, and at the Postal Store Web site at www.usps.com/shop. They should affix the stamps to envelopes of their choice, address the envelopes (to themselves or others), and place them in a larger envelope addressed to: SOUTHEASTERN LIGHTHOUSES COMMEMORATIVE STAMPS, POSTMASTER, 102 SOUTH CAMPBELL AVE, TYBEE ISLAND GA 31328-9991
After applying the first day of issue postmark, the Postal Service will return the envelopes through the mail. There is no charge for the postmark. All orders must be postmarked by July 13, 2003.

http://www.usps.com/communications/news/stamps/2003/sr03_023.txt