Help...lost one of the keys to a 2011 panamera S...

Which dealer has the best price ?

asking cause it does vary.... e.g. recently e46 m3 key was $165 at one dealer n $285 at another for same part #.... had same experience with a Ferrari f430 replacement key as well...

would appreciate any help on what dealer parts dept is the "friendliest" in that respect....

James R