Key prices are set by the local dealerships...but you have the choice of a spare key and the remote key...might as well drop the dime for both so that you won't be caught in this same frustrating situation.
Hopefully your local dealership doesn't charge on the "high" side for the remote key...perhaps if you downlload the coast of the keys from some of the other BMW dealerships that have an online presences...they will price match.
For instance, wwwbmwpartscenter.com (Tomkinson BMW) and
BMW Parts and Accessories at GetBMWparts.com (BMW Silver Spring) both have online web stores where you can input the 11 digit BMW part nbr...print out their prices and take it with you to your local BMW dealership. Present them with the BMW part nbr for the keys (along with you proof of ownership ect that is required) and first see if they are on the higher side...if so, show the print outs and see if they will price match.
I was going to look up the diagram and part nbr for you...but you still don't have a signature with your model/model year/build date...so just go to realoem.com and input the last 7 digits of your VIN...then work your way to BODYWORK (main group) MASTER KEY LOCKING/KEY (sub group) and you'll see the diagrams for the keys...scroll down and get the part nbrs for items
#1,
#3, and
#5 (note there are specific part nbrs for specific build dates...key # 1 may not be available for all build dates). Key #2 is the valet key...it doesn't UNLOCK the glove box and may not be available for X5s built after 10/2003.
- #1 - illuminated key (no remote function & may not be available for X5s built after 10/2003..makes an excellent 2nd key/back up key...cost much less than a remote key)
- #3 - plastic spare key (also makes an excellent back up/emergency key...also costs much less than a remote key)
- #5 - 3 button remote key (make sure you get the correct part nbr based on your vehicle's build date)
- #14 - set of keys includes #2, #3, & #5 (for X5s built prior to 10/2003 build date)
- #16 - set of keys includes #3 & #5 (for X5s built from 10/2003-up)