The OnePlus X Champagne Edition is now available for purchase in India, where Amazon has it listed for INR 16,999, which translates into $255 at current exchange rates. FYI, It is the same price at which the standard Onyx variant can be purchased.
The model made its debut in China, and is already available for purchase in several other countries. OnePlus has also announced open sales of the device on every Tuesday, but, unfortunately, that's only for international markets.
This means, in India you'll have to have an invite to get the limited-edition variant, although an invite to the standard model will do.
They should make one in black and gold as well. Not sure why the first 2 have silver sides when gold works better with black, and definitely better than white.