Early A-body Trunk key blank source?

VDART said

do you have any old locksmiths in town?
Our local still had a key blank on the wall in stock-- cost like $1.50 each-- worked like a champ.
Lawrence

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Unfortunately not. The closest thing I have is an old hardware store. And they did not have it. There is a place a ways off in Cincinnati that I think would be a chance. I just need to find the time to drive in and have a look.
Thanks!