I was shocked at just ho much of a premium Sat Nav seems to add to a car. I only recently bought mine, and have included a couple of examples from autotrader, with the age, spec milage etc which I was looking for.
Cheapest 3.0i in my area, with a good spec
http://search.autotrader.co.uk/es-uk/www/cars/BMW+Z4/Ne-2-4-5-6-7-8-27-44-49-53-61-64-67-103-133-146-236,N-40-113-4294965351-4294967202/advert.action?R=200824311972198&distance=21&postcode=GU16+8XL&channel=CARS&make=BMW&model=Z4&min_pr=&max_pr=&max_mileage=40000
Cheapest 3.0i in my area with a goodspec and Sat Nav + TV
http://search.autotrader.co.uk/es-uk/www/cars/BMW+Z4/Ne-2-4-5-6-7-8-27-44-49-53-61-64-67-103-133-146-236,N-40-113-4294965351-4294967202/advert.action?R=200824311927214&distance=27&postcode=GU16+8XL&channel=CARS&make=BMW&model=Z4&min_pr=&max_pr=&max_mileage=40000
On top of this the Manual versions seem to be rarer still!
If I hadnt been able to find the spec I was after for a good price, I would definitely had retrofitted Sat Nav..