Thanks Michael. I have managed to get one of these units with the disks. I paid 260, which might seems steep, but i intend to go the whole hog and replace keys e.t.c. as well.
I spoke to Nissan and got some seriously deluded quotes. 1200 for the whole thing + labour, followed by a twilight zone quote of 3,500+ if i
just want the DVD reader.
Phoned Clarion and they aren't allowed to sell 350 unit directly to public (maybe no surprise there).
In any case, i got one, so i'll be following your footsteps. Thanks for all the tips.