I've bought the MMI HD unit from BimmerTech (
www.bimmer-tech.net, or contact Nelson or Patrys here on the forums) and the 5/2.4Ghz MirrorLink w/HDMI off eBay (
link here).
PS: If you have an iPhone/iPad, you might consider BimmerTech SmartView HD (
link here). I have an Android phone and didn't want the AppleTV that comes with SmartView, so I bought something more suited for an Android instead.