Well, specific details are a secret that I keep to myself. If I told everyone where I shop, there wouldn't be any left for me to make awesome bags for you! ;)
I will say that with some of my geek prints, I work with a graphic designer to create one of a kind prints that are only available at SbJL. I also have branched out and created a few prints on my own (for example, the Tolkien prints are my own layout)
Otherwise, I spend entirely too much time shopping for fabric, looking for new prints to add to the shop. ;)