AMD Firewalls $100
You have to realize that not many people are going to change out a firewall. A body firewalls don't typically rot out other than the bottom where it meets the floor pan (easy fix). On the other hand, E body are notorious for rotting where the water drain is in the middle.
Im was tempted to buy a couple of these but the shipping cost makes it not such a great deal for a part I really don't need.
They seem to be only discontinuing parts that are not high sellers. Your floor pans, quarters etc should be available for quite some time.
If they were smart they would concentrate on 73+ A bodys. Lots of people fixing these up now and there are a lot out there.