Hallmark hasn't been bold enough yet, but American Greetings has Patriot Day Cards. The link was corrected from an earlier post where it expired; that one shouldn't, but it should be findable from americangreetings.com in any case.
If you'd like to tell them what you think of this, they are:
American Greetings Corporation One American Road Cleveland, Ohio 44144-2398 216/252-7300 Fax: 216/252-6778
Their toll free customer service number is: 800/777-4891.
Maybe they could tell us where that $2.95 $3.25 is going, or why it's time to have greeting cards when the hole in New York isn't filled yet and the war isn't over and a lot of important questions haven't been answered. Or what the hell they thought they were doing.
Hmm. Now Hallmark's site is down for maintenance. I hope they don't...