FYI - that site says clearly that it is NOT affiliated with Spitfire Headers. It's just some guy who has them on his car. Harold doesn't have a website. Just call him and order them COD. I got mine in exactly 2 weeks.
As for them being expensive, I guess it's relative to what you make, but I think TTI's at $750 to $800 and Doug's at about $800 from Summit, Spitfires are a steal at $250 shipped. Actually, I think I paid $235 shipped.