I'm selling my snap-in adapter following upgrade to iPhone 5. This is the top of the line media version (so BMW apps, video and everything else work) and is the 2.0 version with the fan to stop overheating.
It is in perfect order, less than 6 months old and not used very often.
They retail from BMW at £155, I'd let it go for a round £100 inc postage.
Send a PM if interested.