We at Gaijinmanga are currently looking into things to merchandise. We want to make quality collector's items from your favorite manga. If you have any ideas on the types of things you would like to see, feel free to contact us. Reply to this post or join our forums and post there! We currently have a few ideas specifically for Bibliography but we can't have too many ideas so if you can think of something you would like to see from any of our manga, let us know.
We do have one thing that is definitely in the works as I write this right now! A special limited edition of the first volume of Bibliography. It's a collector's item! Like I said, it's still in the works, but keep checking back because we'll let you know when the volume is available.