Just came back from dealer in Thousand Oaks , California.
1 key for 1983 300SD (the security kind) $18.25
1 key for 1980 300D (regular sides cut) $25.00

Okay price I guess. I could have had the 300D cut for $4
at the locksmith but it would have been brass and I wanted
OEM steel key. At least I think that is what I am getting.

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80 300D 340K Owned 30 yrs
83 300SD 440K Owned 9 yrs - Daily Driver 150mi/day
02 Z71 Suburban 117,000
15 Toyota Prius 2600 miles
00 Harley Sportster 24k
09 Yamaha R6
03 Ninja 250