The X-S1 is now discontinued at Adorama (see here). It still is in stock in other US stores like Amazon here and BHphoto here. As I already told you, an anonymous source told me that the X-S1 would be replaced soon by an X-S2 with X20 tech. I don’t have any news from trusted sources about it.
Oh, and if you don’t mind about a little scratch at the top left cover and don’t care about this cosmetic problem, then you should check this X100S at ebayUS (click here). You save $100.