Yep, Spam Board. And you can ask people here for commisions which is also under the Spam Board. And of course, there's Ebay if you're willing to order from China. xD
If you're going to a con before doing this cosplay, they sometimes sell costumes there. Although the prices are quite high.
Dragon*Con '11- Sansa Stark, Little Sister, Belldandy, Rainbow Dash