RNS-E up for sale on another Audi forum..
 

..if anybody is looking for one

http://audisrs.com/about44252.html&highlight=

Is that going to be compatible with a facelift D2 (unlike the very new ones pointed to recently)?
If so presumably there would be some fascia changes too?

Originally from A3 with modified fascia for other car. Should work in facelift D2 currently fitted with RNS-D. With fascia change of course.

You ideally want a fascia from a C5 A6 for it to be a relatively straight swap (trimming a bit of material off the fascia)

There's a few sellers that could probably source you one from a broken unit