I've done a fair amount of comic conventions now, and I am slowly (SLOWLY) learning how they work. Slowly I'm learning things that I'm sure are obvious to others. For example, having a giant bright colored image that attracts the eye of people walking by really makes it easier to sell stuff. It works much much much better than telling people how good the reviews were for your book about Turkmenistan.
Anyway, here a few brightly colored dancing storm troopers that will be printed big and bold to catch the eyes at the next con.
If you feel like dancing, I recommend Tighten Up by Archie Bell and the Drells.