I got two new Master keys from UnitedAutoSecurity for 200 including overnight shipping both ways. I sent them my EWS and (my only) key and they cut and programmed the new ones. I was back in action within 3 days. The new keys programmed easily to my OEM security/keyless system.

This is a good option if you're not the original owner of the car and aren't positive as to whether the lock cylinders or modules have been replaced. A dealer will only supply you with a duplicate of the key that was supplied with your car when it rolled out from the factory.