Best Place to Buy TTI Headers?

I'm looking to buy a set of TTI headers and was wondering which vendor I should use or should I buy them direct from the manufacturer? Does anyone have a good experience that they can share? I know that Mancini, Hughes and Indy are retailers, but I've had customer service issues with all of them. I am looking for someone who realizes what an expense this is and doesn't act like they are doing me a favor by taking my money. These are the headers that I'm looking to buy.

https://www.ttiexhaust.com/TTi340W2-17835.htm#pricing