doug's and autozone ?

I'm getting ready to purchase a set of doug's headers for my 72 swinger. I had read on the forum that autozone has them with 20%off codes. I went to the site and put d453 (coated headers) in the cart. When i went to check out, it said the item is no longer available??? Has anyone come across this? It's a great deal on headers!! Gonna try calling the store tomorrow to see what they say!