You might want to alert your purchasing department to be on the look out for Gintama: The Movie so you can add it to your anime collection. Sentai Filmworks announced that it has acquired the license for the Gintama: The Movie. The company is planning on releasing the movie later this year on DVD and Blu-Ray.
http://www.animenewsnetwork.com/news/2012-02-09/sentai-filmworks-licenses-gintama-the-movie