I got mine from Ohio Speed many years ago for about $850, they are way more expensive now than that price and usually special ordered. There are (2) (Carbon Fiber) Deck Lids even worth considering - Anderson and VIS Racing. I don't think Siebon is making them any more. You can buy the Anderson Lid cheaper from a aftermarket supplier (like the Grudge Link).
I painted the underside of mine to give it a finished look at car shows. It fit almost perfect. The gel coat finish is excellent, and no need to clear coat it.
https://andersoncomposites.com/colle...evrolet-camaro
https://grudgemotorsports.com/produc...tl1011chcam-st
https://visracing.com/i-30497856-car...model%3DCAMARO