Try Jando Fabrics. http://www.jandofabrics.com/.
They don't have exactly what you are looking for. However on their web site they state the following: "If you would like a satin fabric that you do not see on our website, please feel free to ask, as we have access to satins in a variety of durability, fibers, weights and widths."
I would contact them, you have nothing to loose.