One of them is called Rainbow Shiu or something like that. If you search for that on Google, you'll find places where she's posted contact information on other discussion boards.
Some people I know have loved her stuff, others have been very disappointed. I think it all depends on the garment fitting properly, which depends on taking good measurements. I figure the prices are so good it's worth the risk if you can afford to lose the $100 or so for the dress if it doesn't come out right (her stuff on eBay is often sold "no returns").