The best way is to find a friend that is giving up theirs and have them transfer the seats (though this is rare enough). The waiting list is ridiculous.
this is how I got my season tickets. Had a friend of friend who's husband had the tickets, he passed, and she doesn't like going to the games. She had a nephew who wasn't a saints fan, so she knew he would sell the tickets and not go to the games. I lucked up big time, because I got those tickets the year we went to Superbowl.