If not Dougs d453 or TTI, which ceramic?

The same thing happened to me with Doug's Headers on the Autozone Website. If you're able to at least add them to the cart and show the discounted price, then you can go to Jeg's and they will price match them even with the discount. That's what I did and I got Doug's D453's shipped to my door for $503.00 bucks.

The caveat is that you need to call Jegs and explain that they are out of stock, but have a discount. A Jeg's rep will then go to the Autozone website and add the item to the cart and apply the discount. This is so they can have proof of the discount.

Hopefully, this method still works. If it does, then you're in luck!