EKA and Radio Codes- how much are they these days

Hi all,
What is the current cost to obtain these codes and how much hassle would be involved ?
The car is a 1998 4.6 - had a new engine about 30K ago.
Is a "Limited Edition" an official RR model or just a made up one by dealers-what could one expect extra to the normal HSE spec?
Thanks all

eka code shouldnt cost a penny, i had to get mine recently from the main dealer, they gave me a bit of hassle but if you just insist that they have to be able to provide it then they should give in!! Not to sure about getting the radio code though. oh your need proof of ownership when asking for the eka aswell.