Key from the dealer or independent shop will be less than $35, will be made of steel instead of brass, and is cheap at the price.

I actually did wear one out -- the original for the 220D after 32 years doesn't work well, although I've not tried it in the new lock cylinder.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!