First time I saw them, they were less than $400. Really good price. Then they went out of stock (sold out be my guess) and price was all the sudden almost $700. I found a place that said they had a set and paid for them at the lower price but they couldn't find them so I waited for them to be back in stock before they shipped me a set. Might be low volume, but they almost doubled the price and still sold out the second batch (I am assuming).
Note that the A-Body headers were mid-length stainless headers, but not full long tubes. The Dakota and E-Body headers I last looked at seemed like were closer to $1000.