Yep, I've a 2010 E84 20d SE Xdrive that (amongst a load of other things) I had cruise retrofitted to about a year ago.
Relatively simple to do (certainly simpler than the 6NR retro)
You'll need
lower dash cowl
cruise enabled slip ring (there are several different types, make sure you get the right one for your car)
lastly you'll need it coded, I used a chap from the South Coast who travelled to me as I gave him a full days work with all the retros I had him do.
According to my cost monitoring for the car, the cruise retro cost me a total of £138
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