There were three, and the third one was really bent up. It's a local surplus place in minneapolis and they "don't do the internet" (their phrase, not mine). They had a couple of 18" x 18" plates with 1 1/2" fins last time I was there for $25 each. They also have this profile in 6' sections pretty cheap.
Now I'm interested, what surplus place? Axeman's or someplace I haven't heard of yet?