I hear ASDA is offering both the "old" X360 wireless adaptor and the new N one (black, two antennae) for the same price. It might be a mistake so be quick to check it out.
The new wireless adapter is supposed to be replacing the old one at the same RRP. The old wireless adapter is getting discontinued, IIRC. -hl718
afaik, the "old" one goes for 75ish and the new one for 100 at shops across the US. Where did you get your source regarding the discontinuation? Wouldn't they also have to release it in white for non-elite users?
