The cost is only part of the hassle. MB has implemented new rules when it comes to replacement keys. No phone orders. Proof of ownership required, along with photo ID. Pay in advance. And the newest one? Only the vehicle owner, or a pre-determined representative of the owner, can take possesion of the new key.

Hey JWalb, I know replacement keys are expensive, but believe me when I tell you, that when your key decides to call it quits, it will happen at the worst possible time. You'll wish you had bought a spare at any price. I see this stuff happen all the time.