Turquoise International
contact ali from turquoise. he's got his own factory too, so he can make what you want. very high quality and durable costumes. if you work with him, please tell him sabrina from san diego sent you.
Joharah International - Belly Dance Costumes and supplies, selling to retail, wholesale and distributor levels
she always has pretty, affordable styles too. she also works with a lot of troupe costuming.
Wholesale BellyDance and Egyptian Products
you have to contact them to get a login to see prices. they can make custom costuming and are very reasonable for bulk orders too.
good luck. hope you find what you want. please post pics when the project is complete :)