340 exhaust heat shield needed for Van's to repop.

You do make a good point. It would be interesting to know what the tooling cost was and what it costs to stamp and produce every one of those 69 rear decklid panels. 69 was the lowest production year of the 67-69 Barracudas, so it is a rather limited market to start with. I wonder how many of them they have sold. I would certainly agree that once the tooling costs were recovered the company should lower the price to cost of production plus a reasonable profit, but they never do.
I don't know why I remember the number, but in the early 80s those trunk panels were available NOS from Chrysler for $108. That's close to $400 in today's money, and that was when the cars were less than fifteen years old. They've always been crazy expensive.