The cheapest i've seen somebody sell their non s-tune nismo exhaust on here was $450 earlier this year from a guy in either Duncanville or Desoto, can't remember which. Check this thread periodically since they tend to go pretty fast when they do get listed. You just never know one might come along with your name on it. GL!
Anyway, I think you're the one i've seen around hwy-78..i'm from Allen I go through there when I visit Rockwall.