Just build them yourself!! I'm no expert, and I was able to do equal length mild steel headers, and set of stainless side pipes at home in the garage. MIG welder+grinder=TIG welder only for a lot less money, and much less skill required. I would not try stainless headers because butt welding stainless is not easy, and I wanted the thermal properties of ceramic coating under the hood.
-Jon
(This is hi temp paint, I'll have them coated after final fitting)