For several years I collected federal commemorative badges (inaugural; millennium; anniversiary; special event; Olympic; etc). At one point, my collection was well over 150 badges. A few years ago I decided the hobby was a little too time consuming so I get rid of almost all of them. I only kept the ones from the agency I work for. I still have a couple of others floating around I have not managed to sell yet. It is a great hobby, but it can expensive and addictive!
Gonzo