You may only have the table space that is flat, but you also have the drape space below the table surface and above your table for display. That will really increase the amount of display area you would have.
You can make something out of a poster board presentation folder or any number of things.
Like Paper Princess wrote: I would also look into getting something for your table that will add height to your display, and maximize your "sales area". Maybe a small set of book shelves.
Those snap bags made with metal measuring tape closures have been a great hit here.